Add rstcheck

[Alrobbertz]

This PR adds a package rstcheck which validates syntax and formatting of .rst based Sphinx documentation. The advantage of adding this package is that it can report simple errors in docs formatting without needing to build the documentation, either locally or in the pipeline. The rstcheck tool is added both as a pre-commit hook as well as a pipeline step in the docs pipeline.

To run the rstcheck tool locally you can use the following command from the root of the hermes_core repository.

rstcheck -r docs

closes #96

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a7315cb) 94.28% compared to head (ea0e9bf) 94.28%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #106   +/-   ##
=======================================
  Coverage   94.28%   94.28%           
=======================================
  Files          10       10           
  Lines        1767     1767           
=======================================
  Hits         1666     1666           
  Misses        101      101           

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[ehsteve]

I did not know that this existed. Looks good!