User data example

[barneydobson]

Description

• Add a notebook demonstrating using custom data

Fixes #370 (raised by @meghnathomas )

• Organise notebooks separately from guides

Fixes #393 (raised by @cbuahin )

Type of change

• Documentation (non-breaking change that adds or improves the documentation)
• New feature (non-breaking change which adds functionality)
• Optimization (non-breaking, back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)
• Breaking change (whatever its nature)

Key checklist

• All tests pass (eg. python -m pytest)
• The documentation builds and looks OK (eg. python -m sphinx -b html docs docs/build)
• Pre-commit hooks run successfully (eg. pre-commit run --all-files)

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added or an issue has been opened to tackle that in the future. (Indicate issue here: # (issue))

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.84%. Comparing base (500f41c) to head (588772e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #396      +/-   ##
==========================================
- Coverage   88.06%   87.84%   -0.22%     
==========================================
  Files          23       23              
  Lines        2279     2279              
  Branches      287      287              
==========================================
- Hits         2007     2002       -5     
- Misses        193      194       +1     
- Partials       79       83       +4     

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[dalonsoa]

I've a question, but otherwise this looks fine.

[cheginit]

LGTM.

Please check the rendered version of the notebooks for warnings. There are quite a few warnings in this notebook.