Update documentation

[ffl096]

• Add numpydoc for more consistency with their documentation and for docstring validation.
• Setup intersphinx (see Setup intersphinx for our documentation #296).
• Fix documentation issues raised by numpydoc.

This closes #95. Crossref. pyt-team/TopoEmbedX#35 and pyt-team/TopoModelX#246.

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (ada1f19) 97.36% compared to head (fc73e9c) 97.29%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #297      +/-   ##
==========================================
- Coverage   97.36%   97.29%   -0.08%     
==========================================
  Files          29       29              
  Lines        3375     3359      -16     
==========================================
- Hits         3286     3268      -18     
- Misses         89       91       +2     

Files	Coverage Δ
toponetx/algorithms/components.py	95.23% <100.00%> (ø)
toponetx/algorithms/distance.py	100.00% <100.00%> (ø)
toponetx/algorithms/distance_measures.py	100.00% <100.00%> (ø)
toponetx/algorithms/spectrum.py	100.00% <100.00%> (ø)
toponetx/classes/cell.py	100.00% <100.00%> (ø)
toponetx/classes/cell_complex.py	99.22% <100.00%> (-0.01%)	⬇️
toponetx/classes/colored_hypergraph.py	89.72% <100.00%> (-0.11%)	⬇️
toponetx/classes/combinatorial_complex.py	92.64% <100.00%> (-0.14%)	⬇️
toponetx/classes/complex.py	100.00% <100.00%> (ø)
toponetx/classes/hyperedge.py	100.00% <100.00%> (ø)
... and 9 more

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