api docs template

[OriolAbril]

I have modified the API docs for the distributions subsection so it can serve as
a template to update the rest of the modules (both present and missing, I haven't checked
if there are important functions missing from the api docs).

Key points:

• make sure that objects are documented at the path we want users to import them from.
  Users will do pymc.Normal, not pymc.distributions.continuous.Normal so the class
  should be documented as pymc.Normal
• Use autosummary with :toctree: option instead of automodule. This is more personal preference,
  but I think it looks better if each object has its own page. It is still easy to navigate between
  objects because they are all listed in the left sidebar.
• Make sure docs are working properly. The transform module is not rendering right,
  not really know why but sphinx doesn't like it and refuses to see pymc.transforms as a module,
  any ideas?

[codecov]

Codecov Report

Merging #5266 (10e32df) into main (95bd5e5) will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5266      +/-   ##
==========================================
+ Coverage   78.94%   79.18%   +0.23%     
==========================================
  Files          88       88              
  Lines       14237    14353     +116     
==========================================
+ Hits        11240    11366     +126     
+ Misses       2997     2987      -10     

Impacted Files	Coverage Δ
pymc/model.py	83.26% <ø> (-0.05%)	⬇️
pymc/distributions/transforms.py	92.55% <100.00%> (+0.59%)	⬆️
pymc/backends/report.py	89.51% <0.00%> (-2.10%)	⬇️
pymc/distributions/dist_math.py	86.78% <0.00%> (-0.92%)	⬇️
pymc/gp/gp.py	93.18% <0.00%> (-0.43%)	⬇️
pymc/__init__.py	96.00% <0.00%> (-0.08%)	⬇️
pymc/backends/arviz.py	89.51% <0.00%> (-0.05%)	⬇️
pymc/sampling_jax.py	0.00% <0.00%> (ø)
pymc/initial_point.py	100.00% <0.00%> (ø)
... and 7 more