Repair the plot of pm.Interpolated and add an example for pm.Deterministic

[Armavica]

This PR closes #6124 by adding an example and explanation of pm.Deterministic.

It also repairs the plot of pm.Interpolated which was not working, and fixes some of the doc makefile commands.

Checklist

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

Major / Breaking Changes

• ...

Bugfixes / New features

• ...

Docs / Maintenance

• Fix make serve
• Fix make html
• Fix make clean
• Repair the plot of pm.Interpolated
• Add an explanation and example to pm.Deterministic

[codecov]

Codecov Report

Merging #6126 (c032d6e) into main (bbb3082) will decrease coverage by 0.48%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6126      +/-   ##
==========================================
- Coverage   91.02%   90.54%   -0.49%     
==========================================
  Files          99      102       +3     
  Lines       20531    21241     +710     
==========================================
+ Hits        18689    19233     +544     
- Misses       1842     2008     +166     

Impacted Files	Coverage Δ
pymc/distributions/continuous.py	97.51% <ø> (ø)
pymc/distributions/transforms.py	100.00% <ø> (ø)
pymc/model.py	88.23% <ø> (ø)
pymc/variational/test_functions.py	38.09% <0.00%> (-61.91%)	⬇️
pymc/variational/stein.py	48.33% <0.00%> (-51.67%)	⬇️
pymc/variational/operators.py	57.14% <0.00%> (-35.72%)	⬇️
pymc/variational/inference.py	50.77% <0.00%> (-35.32%)	⬇️
pymc/variational/approximations.py	54.79% <0.00%> (-32.53%)	⬇️
pymc/variational/callbacks.py	78.00% <0.00%> (-18.00%)	⬇️
pymc/variational/opvi.py	75.20% <0.00%> (-11.85%)	⬇️
... and 19 more

[ricardoV94]

My review concerns the changes in docstrings, not the changes to the makerfile