Several API doc improvements

[OriolAbril]

• Add autogenerated links in type specifications
• added example link to navbar
• disabled the autodoc feature that appended the docstring of __init__ to the class docstring (which effective added the docstring of the base distribution init to every single distribution).
• modified autosummary template to generate files for all methods automatically. But to speed up the build process, loading time and not clutter the sidebar too much, those are not included in the sidebar
• Updated gp api docs to document objects where we want users to import them from (I think). I used pymc.gp for implementations, pymc.gp.mean for means and pymc.gp.cov for covariance. Moreover. I added aliases so that using Mean and Covariance in type descriptions generates links to the respective module (this is not working yet because the docstrings don't follow numpydoc yet)
• Update docstring of pymc.Uniform to comply with numpydoc

[OriolAbril]

/pre-commit run

[codecov]

Codecov Report

Merging #5367 (f15bde5) into main (d52655d) will decrease coverage by 17.18%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             main    #5367       +/-   ##
===========================================
- Coverage   80.36%   63.18%   -17.19%     
===========================================
  Files          89      132       +43     
  Lines       14808    26070    +11262     
===========================================
+ Hits        11901    16473     +4572     
- Misses       2907     9597     +6690     

Impacted Files	Coverage Δ
pymc/distributions/continuous.py	96.93% <ø> (-0.50%)	⬇️
pymc/tests/sampler_fixtures.py	0.00% <0.00%> (-84.90%)	⬇️
pymc/ode/utils.py	17.85% <0.00%> (-82.15%)	⬇️
pymc/smc/smc.py	17.99% <0.00%> (-79.92%)	⬇️
pymc/bart/pgbart.py	17.85% <0.00%> (-77.39%)	⬇️
pymc/variational/updates.py	11.33% <0.00%> (-76.36%)	⬇️
pymc/bart/utils.py	6.52% <0.00%> (-76.09%)	⬇️
pymc/smc/sample_smc.py	16.77% <0.00%> (-66.45%)	⬇️
pymc/bart/tree.py	37.68% <0.00%> (-62.32%)	⬇️
pymc/ode/ode.py	24.24% <0.00%> (-60.61%)	⬇️
... and 78 more

[canyon289]

/pre-commit-run

[canyon289]

/pre-commit-run

Needs that extra dash 💨