Improve docs website navigation

[kelly-sovacool]

Changes

• Improve sidebar navigation
• More details for usage
• Streamline re-use of docs sections

Issues

see also CCBR/actions#55

PR Checklist

(Strikethrough any points that are not applicable.)

• This comment contains a description of changes with justifications, with any relevant issues linked.
• [ ] Write unit tests for any new features, bug fixes, or other code changes.
• Update docs if there are any API changes.
• Update CHANGELOG.md with a short description of any user-facing changes and reference the PR number. Guidelines: https://keepachangelog.com/en/1.1.0/

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 35.58%. Comparing base (b09738b) to head (805187a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ccbr_tools/jobinfo.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #28      +/-   ##
==========================================
+ Coverage   35.12%   35.58%   +0.45%     
==========================================
  Files          19       19              
  Lines        1318     1318              
==========================================
+ Hits          463      469       +6     
+ Misses        855      849       -6     

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