Setup documentation builds on Readthedocs

[valeriupredoi]

Description

• Add RTD docs build dependencies
• Add badge and link in README
• Change PR standard test to include correct link to RTD builds

Checklist

• This pull request has a descriptive title and labels
• This pull request has a minimal description (most was discussed in the issue, but a two-liner description is still desirable)
• Unit tests have been added (if codecov test fails)
• Any changed dependencies have been added or removed correctly (if need be)
• If you are working on the documentation, please ensure the current build passes
• All tests pass

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.93%. Comparing base (6d06841) to head (4e14df2).
⚠️ Report is 168 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #80   +/-   ##
=======================================
  Coverage   71.93%   71.93%           
=======================================
  Files          11       11           
  Lines        2423     2423           
  Branches      364      364           
=======================================
  Hits         1743     1743           
  Misses        583      583           
  Partials       97       97           

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