Docs: add rules context dynamically

[Guts]

In this PR we generate the rules context dynamically for the documentation using a Sphinx hook. Then it's embedded like this:

To merge after #484.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.85%. Comparing base (2975e43) to head (5d3a2be).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #485   +/-   ##
=======================================
  Coverage   70.85%   70.85%           
=======================================
  Files          47       47           
  Lines        2910     2910           
  Branches      631      631           
=======================================
  Hits         2062     2062           
  Misses        668      668           
  Partials      180      180           

Flag	Coverage Δ
unittests	70.30% <ø> (ø)

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see 2 files with indirect coverage changes

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud