Remove dead Plain Language resource URL causing HTMLProofer failure

[Copilot]

One-line summary

Remove the stale Plain Language Association International link that now returns 404 and breaks the scheduled Checking links workflow.

Description

The Building site and running HTML proofer job failed because one external URL in site content became invalid. This change removes only that broken link from the Plain Language guide resources list to restore link-check stability without relaxing checks.

• Failure source
  • HTMLProofer reported a 404 for https://plainlanguagenetwork.org/plain-language/what-is-plain-language/.
• Applied fix
  • Removed that single resource entry from _guide/plain-language.md.
• Code snippet

  ## Resources
  
  * [Federal Plain Language guidelines](https://www.plainlanguage.gov/guidelines/)
  * [WCAG 2.1 Reading level success criterion](https://www.w3.org/WAI/WCAG21/Understanding/reading-level.html)

Types of Changes

What types of changes does your code introduce? Keep the ones that apply:

• Bug fix (non-breaking change which fixes an issue)
• Documentation / non-code

Tasks

List of tasks you will do to complete the PR

• Identify the exact failing URL from Actions logs (job 80073713142)
• Remove the broken external link from content
• Keep workflow/checker configuration unchanged

Review

List of tasks the reviewer must do to review the PR

• Tests
• Documentation
• CHANGELOG

Deployment Notes

None.

[dmundra]

Tugboat has finished building the preview for this pull request!

Link:

• https://pr894-udkrrepos9epjqq7zglfptwdheyimulj.tugboatqa.com

Dashboard:

• https://dashboard.tugboatqa.com/6a26cdc48d4b207196d48faf

[github-actions]

Pa11y testing results

> pa11y-ci:sitemap
> pa11y-ci --sitemap http://127.0.0.1:4000/sitemap.xml --sitemap-find https://accessibility.civicactions.com --sitemap-replace http://127.0.0.1:4000 --sitemap-exclude "/*.pdf"

Running Pa11y on 133 URLs:
 > http://localhost:4000/guide/champions-program - 0 errors
 > http://localhost:4000/guide/defect-priority - 0 errors
 > http://localhost:4000/guide/design - 0 errors
 > http://localhost:4000/guide/documents - 0 errors
 > http://localhost:4000/guide/events - 0 errors
 > http://localhost:4000/guide/glossary - 0 errors
 > http://localhost:4000/guide/history - 0 errors
 > http://localhost:4000/guide/identity-language - 0 errors
 > http://localhost:4000/guide/introduction - 0 errors
 > http://localhost:4000/guide/onboarding-staff - 0 errors
 > http://localhost:4000/guide/organizations - 0 errors
 > http://localhost:4000/guide/plain-language - 0 errors
 > http://localhost:4000/guide/resources - 0 errors
 > http://localhost:4000/guide/semantic-html - 0 errors
 > http://localhost:4000/guide/social-media - 0 errors
 > http://localhost:4000/guide/tools - 0 errors
 > http://localhost:4000/guide/training - 0 errors
 > http://localhost:4000/about/people/allison-carroll - 0 errors
 > http://localhost:4000/about/people/civicactions - 0 errors
 > http://localhost:4000/about/people/daniel-mundra - 0 errors
 > http://localhost:4000/about/people/jack-haas - 0 errors
 > http://localhost:4000/about/people/jennifer-houde - 0 errors
 > http://localhost:4000/about/people/jonathan-bourland - 0 errors
 > http://localhost:4000/about/people/luke-fretwell - 0 errors
 > http://localhost:4000/about/people/michelle-kang - 0 errors
 > http://localhost:4000/about/people/mike-gifford - 0 errors
 > http://localhost:4000/about/people/nira-datta - 0 errors
 > http://localhost:4000/about/people/vanessa-luxen - 0 errors
 > http://localhost:4000/personas/accessibility-avery - 0 errors
 > http://localhost:4000/personas/designer-darcy - 0 errors
 > http://localhost:4000/personas/engineer-emery - 0 errors
 > http://localhost:4000/personas/procurement-parker - 0 errors
 > http://localhost:4000/personas/qa-quincy - 0 errors
 > http://localhost:4000/personas/remote-raz - 0 errors
 > http://localhost:4000/playbook/AT - 0 errors
 > http://localhost:4000/playbook/ai-and-ia - 0 errors
 > http://localhost:4000/playbook/authoring - 0 errors
 > http://localhost:4000/playbook/automated-testing - 0 errors
 > http://localhost:4000/playbook/checklists - 0 errors
 > http://localhost:4000/playbook/community - 0 errors
 > http://localhost:4000/playbook/distributed-teams - 0 errors
 > http://localhost:4000/playbook/documents - 0 errors
 > http://localhost:4000/playbook/follow-global-initiatives - 0 errors
 > http://localhost:4000/playbook/manual-testing - 0 errors
 > http://localhost:4000/playbook/personalization - 0 errors
 > http://localhost:4000/playbook/practice - 0 errors
 > http://localhost:4000/playbook/pwd - 0 errors
 > http://localhost:4000/playbook/roles - 0 errors
 > http://localhost:4000/playbook/statements - 0 errors
 > http://localhost:4000/playbook/training - 0 errors
 > http://localhost:4000/posts/4-ways-to-improve-government-accessibility-through-open-source - 0 errors
 > http://localhost:4000/posts/hello-world - 0 errors
 > http://localhost:4000/posts/whitehouse.gov-beginning-an-accessibility-journey - 0 errors
 > http://localhost:4000/posts/gcn-accessibility-compliance-as-code - 0 errors
 > http://localhost:4000/posts/improve-government-accessibility-through-open-source - 0 errors
 > http://localhost:4000/posts/govtech-how-will-biden-transform-government-website-accessibility - 0 errors
 > http://localhost:4000/posts/automated-accessibility-testing-leveraging-github-actions-and-pa11y-ci-with-axe - 0 errors
 > http://localhost:4000/posts/government-accessibility-and-the-cms-problem - 0 errors
 > http://localhost:4000/posts/at-banter-podcast - 0 errors
 > http://localhost:4000/posts/mvp-playbook - 0 errors
 > http://localhost:4000/posts/mvp-guide - 0 errors
 > http://localhost:4000/posts/smashingmag-baking-in-accessibility-testing - 0 errors
 > http://localhost:4000/posts/qa-with-mike-gifford-accessibility-in-civic-tech - 0 errors
 > http://localhost:4000/posts/launching-a-community-of-practice-for-accessibility-in-government-services - 0 errors
 > http://localhost:4000/posts/pre-GAAD-Authoring-Tools-Built-in-Accessibility - 0 errors
 > http://localhost:4000/posts/website-analytics - 0 errors
 > http://localhost:4000/posts/how-we-scale-inclusive-website-content-with-automated-testing-and-open-source-tools - 0 errors
 > http://localhost:4000/posts/social-media-accessibility-guide - 0 errors
 > http://localhost:4000/posts/plain-language-accessibility-guide - 0 errors
 > http://localhost:4000/posts/heart-accessibility - 0 errors
 > http://localhost:4000/posts/scanning-over-two-million-gov-pages - 0 errors
 > http://localhost:4000/posts/gsa-machine-readable-acr - 0 errors
 > http://localhost:4000/posts/CivicActions-Creates-Open-Product-Accessibility-Template - 0 errors
 > http://localhost:4000/posts/how-drupal-helps-us-bake-accessibility-into-every-project - 0 errors
 > http://localhost:4000/posts/CivicActions-Accessibility-Pledge - 0 errors
 > http://localhost:4000/posts/Talking-Drupal-Podcast - 0 errors
 > http://localhost:4000/posts/Talking-Drupal-Podcast-382 - 0 errors
 > http://localhost:4000/posts/governments-accessibility-opensource - 0 errors
 > http://localhost:4000/posts/FOSDEM-ccessibility-OpenSource - 0 errors
 > http://localhost:4000/posts/opensource-automated-accessibility-testing - 0 errors
 > http://localhost:4000/posts/helping-disabled-veterans-check-in-designing-an-accessibility-map - 0 errors
 > http://localhost:4000/posts/daniel-mundra-diving-into-drupal - 0 errors
 > http://localhost:4000/posts/how-omb-can-improve-gov-accessibility - 0 errors
 > http://localhost:4000/posts/fix-accessibility-bugs - 0 errors
 > http://localhost:4000/posts/five-reasons-to-get-excited-about-governmentwide-section-508-assessment-criteria - 0 errors
 > http://localhost:4000/posts/how-we-helped-a-government-website-achieve-zero-accessibility-errors - 0 errors
 > http://localhost:4000/posts/measuring-the-impact-of-manual-accessibility-testing - 0 errors
 > http://localhost:4000/posts/delivering-digital-first-turning-21st-century-idea-into-action - 0 errors
 > http://localhost:4000/posts/prioritizing-accessibility-bugs-for-maximum-impact - 0 errors
 > http://localhost:4000/projects/drupal - 0 errors
 > http://localhost:4000/projects/uswds-color - 0 errors
 > http://localhost:4000/projects/uswds - 0 errors
 > http://localhost:4000/roles/designer - 0 errors
 > http://localhost:4000/roles/developer - 0 errors
 > http://localhost:4000/roles/executive - 0 errors
 > http://localhost:4000/roles/operations - 0 errors
 > http://localhost:4000/roles/procurement - 0 errors
 > http://localhost:4000/roles/product-manager - 0 errors
 > http://localhost:4000/roles/project-manager - 0 errors
 > http://localhost:4000/topics/design - 0 errors
 > http://localhost:4000/topics/disability-type - 0 errors
 > http://localhost:4000/topics/process-policies - 0 errors
 > http://localhost:4000/topics/roles - 0 errors
 > http://localhost:4000/topics/testing - 0 errors
 > http://localhost:4000/topics/tools - 0 errors
 > http://localhost:4000/ACR/Drupal9AccessibilityConformanceReport.html - 0 errors
 > http://localhost:4000/ACR/ - 0 errors
 > http://localhost:4000/about/ - 0 errors
 > http://localhost:4000/accessibility - 0 errors
 > http://localhost:4000/agile - 0 errors
 > http://localhost:4000/analytics - 0 errors
 > http://localhost:4000/calendar - 0 errors
 > http://localhost:4000/colophon - 0 errors
 > http://localhost:4000/about/contact - 0 errors
 > http://localhost:4000/documentation - 0 errors
 > http://localhost:4000/guide/ - 0 errors
 > http://localhost:4000/heart - 0 errors
 > http://localhost:4000/help - 0 errors
 > http://localhost:4000/ - 0 errors
 > http://localhost:4000/news/ - 0 errors
 > http://localhost:4000/about/join - 0 errors
 > http://localhost:4000/license - 0 errors
 > http://localhost:4000/okrs - 0 errors
 > http://localhost:4000/open - 0 errors
 > http://localhost:4000/about/people/ - 0 errors
 > http://localhost:4000/personas/ - 0 errors
 > http://localhost:4000/playbook/ - 0 errors
 > http://localhost:4000/projects/ - 0 errors
 > http://localhost:4000/roles/ - 0 errors
 > http://localhost:4000/search - 0 errors
 > http://localhost:4000/services - 0 errors
 > http://localhost:4000/topics/ - 0 errors
 > http://localhost:4000/ACR/Drupal9AccessibilityConformanceReport-December2020.html - 0 errors

✔ 133/133 URLs passed

[dmundra]

I am fine with removing the link. @mgifford what do you think? The site seems to be dead