update theme

[OriolAbril]

I am switching the pydata-sphinx-theme to pymc-sphinx-theme.
It is a very thin wrapper over the pydata-sphinx-theme to abstract the common
logic between the 3 websites, so we don't need to make changes to the 3
repos every time we want to update something or something breaks.

Checklist

• Explain important implementation details 👆
• Make sure that the pre-commit linting/style checks pass.
• Link relevant issues (preferably in nice commit messages)
• Fill out the short summary sections 👇

Docs / Maintenance

• Change theme to pymc-sphinx-theme

[canyon289]

Assuming docs build this looks good

[OriolAbril]

It should build and 1) look the same + 2) have the same functionality. We have the check the preview very carefully for this PR

[codecov]

Codecov Report

Merging #6296 (2075715) into main (5d7283e) will increase coverage by 0.05%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6296      +/-   ##
==========================================
+ Coverage   94.12%   94.17%   +0.05%     
==========================================
  Files         111      111              
  Lines       23861    23913      +52     
==========================================
+ Hits        22458    22520      +62     
+ Misses       1403     1393      -10     

Impacted Files	Coverage Δ
pymc/step_methods/hmc/quadpotential.py	80.62% <0.00%> (-0.07%)	⬇️
pymc/tests/sampling/test_jax.py	100.00% <0.00%> (ø)
pymc/variational/opvi.py	87.08% <0.00%> (+0.02%)	⬆️
pymc/step_methods/hmc/nuts.py	97.31% <0.00%> (+0.05%)	⬆️
pymc/sampling/jax.py	97.34% <0.00%> (+0.14%)	⬆️
pymc/variational/callbacks.py	96.22% <0.00%> (+0.22%)	⬆️
pymc/blocking.py	95.34% <0.00%> (+0.22%)	⬆️
pymc/step_methods/hmc/hmc.py	92.98% <0.00%> (+0.25%)	⬆️
pymc/variational/operators.py	93.18% <0.00%> (+0.32%)	⬆️
pymc/model.py	90.32% <0.00%> (+0.63%)	⬆️
... and 3 more

[OriolAbril]

Only yhe edit this page button seems to not be working. I'll take a look tomorrow

[OriolAbril]

@twiecki answering pymc-devs/pymc-examples#465 (comment) here. If you look at the preview you will see that the logos are still there. What is being removed is the triplication of this info. Now this is part of the pymc-sphinx-theme which inherits from pydata-sphinx-theme and sets up most of the common elements between al 3 main websittes (and others like pymc-experimental or pymc-bart)

[twiecki]

Amazing!