RTD update

[apetenchea]

Removal of Sphinx context injection at build time has little effect for us.
Read the blog post from Read The Docs for more information.

However, this PR also updates the way docs are being build:

• We're using RTD build hook, which adds a new check for every PR (named docs/readthedocs.org:python-driver-for-arangodb). This comes with the park that we can now easily view the documentation build for every PR by clicking on details (a fake documentation page is generated).
• The docs action is not needed to build the documentation anymore. However, we'll keep it around for now in order to run the docs tests.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.95%. Comparing base (95b791c) to head (c6a86ce).
Report is 6 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #346   +/-   ##
=======================================
  Coverage   95.95%   95.95%           
=======================================
  Files          26       26           
  Lines        4277     4277           
=======================================
  Hits         4104     4104           
  Misses        173      173           

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[aMahanna]

looks good! just left one small question