📝 Initialize Documentation on ReadTheDocs

[burgholzer]

This PR adds the initial configuration and infrastructure for building proper project documentation on ReadTheDocs.

Building the documentation locally is as easy as

nox -rs docs -- serve

nox is best installed via pipx install nox (or brew install nox if you are on macOS). If you don't have pipx (pip for applications) you can install it with pip install pipx (or brew install pipx if you are on macOS).

At the moment the documentation is pretty much empty. Filling it with content will be done in a separate PR.

[codecov]

Codecov Report

Merging #74 (e00547e) into main (2821def) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##            main     #74   +/-   ##
=====================================
  Coverage   91.2%   91.2%           
=====================================
  Files         29      29           
  Lines       1825    1825           
=====================================
  Hits        1666    1666           
  Misses       159     159           

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