Remove notebooks and signpost data analysis repo

[alexdewar]

Description

Now that the muse2_data_analysis repo is set up, users can go here to find example Jupyter notebooks, so we no longer need them in this repository.

Remove the notebooks and signpost this new repo.

Closes #1099.

Type of change

• Bug fix (non-breaking change to fix an issue)
• New feature (non-breaking change to add functionality)
• Refactoring (non-breaking, non-functional change to improve maintainability)
• Optimization (non-breaking change to speed up the code)
• Breaking change (whatever its nature)
• Documentation (improve or add documentation)

Key checklist

• All tests pass: $ cargo test
• The documentation builds and looks OK: $ cargo doc
• Update release notes for the latest release if this PR adds a new feature or fixes a bug
  present in the previous release

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[Copilot]

Pull request overview

Removes in-repo example Jupyter notebooks and updates the user documentation to direct users to the new muse2_data_analysis repository for output-data processing examples (closes #1099).

Changes:

• Updated the user guide to link to muse2_data_analysis for example notebooks.
• Deleted the docs/notebooks/*.ipynb notebooks from this repository.
• Removed notebook-related Python dependencies from doc-requirements.txt.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/user_guide.md	Replaces the in-repo notebooks link with a pointer to the external muse2_data_analysis repo.
docs/notebooks/prices.ipynb	Removes the notebook (no longer maintained in this repo).
docs/notebooks/capacity.ipynb	Removes the notebook (no longer maintained in this repo).
doc-requirements.txt	Drops notebook-only dependencies (pandas/matplotlib/notebook).
.gitignore	Removes an exception rule for assets/settings.toml (file no longer present).

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.52%. Comparing base (ff15327) to head (aa1fd52).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1112   +/-   ##
=======================================
  Coverage   87.52%   87.52%           
=======================================
  Files          55       55           
  Lines        7429     7429           
  Branches     7429     7429           
=======================================
  Hits         6502     6502           
  Misses        630      630           
  Partials      297      297           

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[Aurashk]

seems sensible!