Add copy button to readthedocs

[delucchi-cmu]

Change Description

Adds a copy button to all code blocks in our readthedocs.

🤯 this also adds the copy button to all of the code blocks inside rendered notebooks. It's kind of wild.

see also: lincc-frameworks/python-project-template#408

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4a2d119) 99.74% compared to head (cb0e2d1) 99.74%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #211   +/-   ##
=======================================
  Coverage   99.74%   99.74%           
=======================================
  Files          24       24           
  Lines        1186     1186           
=======================================
  Hits         1183     1183           
  Misses          3        3           

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[delucchi-cmu]

See rendered doc preview: https://hipscat-import--211.org.readthedocs.build/en/211/notebooks/estimate_pixel_threshold.html

[hombit]

It is an EXCITING improvement