Added docs folder at the project root. Added build_docs and publish_d…

[kelvinmwinuka]

• Added docs directory into the main repository for better centralisation.
• Added build_docs and publish_docs jobs in the release workflow to trigger docs publishing on each release.
• Added test_deploy workflow. For now, it only tests if the docs can be built successfully.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.85%. Comparing base (d0dd8db) to head (312f3bb).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
- Coverage   78.90%   78.85%   -0.05%     
==========================================
  Files          50       50              
  Lines        9176     9176              
==========================================
- Hits         7240     7236       -4     
- Misses       1412     1416       +4     
  Partials      524      524              

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