Documentation: Implement automatic spelling check

[activus-d]

This PR solves issue #76 by implementing an automatic spell checking for the documentation using pyspelling instead of sphinxcontrib.spelling.

Changes Introduced

• Updated the docs/Makefile to include:
  • Automated installation of aspell and pyspelling across common operating systems.
  • make run now builds and serves docs, and runs the spelling check.
• Created spellingcheck.yaml: Configures pyspelling to check built HTML files, excluding pages like glossary, index, and style guide.
• Added docs/wordlist.txt, a custom dictionary of valid project-specific terms.
• Updated pyproject.toml to include pyspelling as a documentation dependency.
• Added .gitignore rules to exclude docs/wordlist.dic.
• Improved contributing/index.rst:
  • Linked to repo on the first mention
  • Reworded instructions for serving and watching docs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.0%. Comparing base (5b05c2f) to head (eb430f1).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #77   +/-   ##
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  Coverage   100.0%   100.0%           
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  Files          13       13           
  Lines         748      748           
  Branches       63       63           
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  Hits          748      748           

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