Fix ReadTheDocs build

[duckontheweb]

Related Issue(s): #

• Deploy to ReadTheDocs #16

Description:

Adds requirements-docs.txt with dependencies for building docs in ReadTheDocs (currently just recommonmark)

PR Checklist:

• Code is formatted
• Tests pass
• Changes are added to the CHANGELOG

[codecov-commenter]

Codecov Report

Merging #46 (596085f) into main (77d95a2) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #46   +/-   ##
=======================================
  Coverage   85.09%   85.09%           
=======================================
  Files          13       13           
  Lines         624      624           
=======================================
  Hits          531      531           
  Misses         93       93           

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