Add docs for LabSTX as browser-based alternative to local Clarinet installation

[ProdevappOFFICIAL]

Request: Add LabSTX as browser-based / zero-install alternative for Clarinet

What to add

Please add LabSTX as a convenient browser-based / zero-install alternative to installing and running Clarinet locally.

LabSTX is a full-featured Remix-style IDE built for the Stacks ecosystem. It supports:

• Multi-file Clarinet projects (Clarinet.toml, contracts, tests, settings)
• clarinet check and Clarinet-compatible project workflows
• Testing and deployment directly in the browser

This is especially helpful for newcomers, quick prototyping, or anyone who wants to avoid local setup.

Suggested updates

1. Clarinet Overview – https://docs.stacks.co/clarinet/overview

Current Installation section is very minimal:

brew install clarinet

Installation

Local installation (recommended for production workflows)

brew install clarinet

Browser-based alternative (no installation required)LabSTX — A full Remix-style IDE for Clarity smart contract development on Stacks.Get started instantly:
→ Open LabSTX with Clarity Starter TemplateCreate, edit, test, and deploy multi-file Clarinet projects directly in your browser. Ideal for learning, quick prototyping, or when you prefer zero local setup. Projects are fully compatible with Clarinet (easy import/export).

2. Developer Quickstart – https://docs.stacks.co/get-started/developer-quickstart

After the brew install clarinet command under "Install Clarinet", add a short note:

Prefer working in the browser with no installation? Try LabSTX — a Remix-style IDE fully compatible with Clarinet projects.
Start with the Clarity Starter template

Why this is useful

• Significantly lowers the barrier for new Stacks/Clarity developers.
• LabSTX is built specifically for the Stacks ecosystem.
• Provides an immediate "try it now" experience while staying compatible with official Clarinet workflows.

I'm happy to open a Pull Request with the exact changes if preferred. I can also provide screenshots or a short demo of LabSTX working with Clarinet-style projects.

Thanks for maintaining the docs!