Update uv.lock with pillow 12.3.0 and update .gitignore

[rickecon]

This PR:

• Updates .gitignore to include a line .claude/.
• Updates the uv.lock file to include upgraded pillow package version 12.3.0. This satisfies the dependabot PR update in PR Bump pillow from 12.2.0 to 12.3.0 #1176. I updated all the packages in the environment. This resulted in an update of the pytest package, which caused errors that led to the changes below.
• Updated the version in pyproject.toml, ogcore/__init__.py and CHANGELOG.md.
• Updated the version of pytest in pyproject.toml to pytest>=9.1. Some changes to logging happened in versions 9.1+, that are not backward compatible. All our testing started throwing errors once I updated that package. I changed the pytest miniversion in line 94 of pyproject.toml to 9.1, and I updated the filterwarnings in lines 94-98.
• I updated all the Makefile commands to fit with standard GNU formatting and to work with our updated usage of the uv package. I also got rid of some compute studio commands, the objects of which had no targets.
• I updated the format of the logger.info() warnings in household.py which was a source of errors from the updated pytest package.
• I fixed some errors that were happening in the building of our Jupyter Book documentation. There was a fight going on between our make_params.py and make_vars.py scripts and the Sphinx _toc.yml table of contents script. And we were missing config.rst, SS.rst, and TPI.rst files. I explicitly put the API chapters in the _toc.yml file. And I built an updated parameters.md file.
• We had some Jupyter Book warnings for headings that go from H2 to H4 in parameters.md and variables.md. However, this is what we want. So I added the _ext/supress_header_warnings.py file and referenced it in _config.py in order to surpress only those warnings associated with only the parameters.md and variables.md files.

cc: @jdebacker

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.73%. Comparing base (7ecd125) to head (f5a4a93).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1208   +/-   ##
=======================================
  Coverage   72.73%   72.73%           
=======================================
  Files          22       22           
  Lines        5766     5766           
=======================================
  Hits         4194     4194           
  Misses       1572     1572           

Flag	Coverage Δ
unittests	72.73% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
ogcore/__init__.py	100.00% <100.00%> (ø)
ogcore/household.py	90.90% <ø> (ø)

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[jdebacker]

Just one request to update the changelog.