Add gp-libs

[tony]

Changes

• Render changelog in linkify_issues

• Fix Table of contents rendering with sphinx autodoc with sphinx_toctree_autodoc_fix

• Deprecate sphinx-autoapi, per above fixing the table of contents issue

  This also removes the need to workaround autoapi bugs.

• Test doctests in our docs via pytest_doctest_docutils (built on doctest_docutils)

[codecov]

Codecov Report

Merging #403 (3ea6b82) into master (4d8eec5) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #403      +/-   ##
==========================================
- Coverage   72.75%   72.71%   -0.05%     
==========================================
  Files          25       25              
  Lines        2243     2239       -4     
==========================================
- Hits         1632     1628       -4     
  Misses        611      611              

Impacted Files	Coverage Δ
docs/conf.py	60.43% <100.00%> (-1.67%)	⬇️

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