Updating the docs after introducing the new ParticleDisitribution class

[cosimoNigro]

This PR updates the docs of agnpy, after the large modifications introduced by #124. Only the spectra and emission_regions module documentations are affected, but I am taking the opportunity to make a bit of clean-up and rearrangement of the docs before making a new release.

[codecov[bot]]

Codecov Report

Merging #129 (d9867ad) into master (e1c9f60) will increase coverage by 0.03%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #129      +/-   ##
==========================================
+ Coverage   96.98%   97.02%   +0.03%     
==========================================
  Files          38       38              
  Lines        3122     3094      -28     
==========================================
- Hits         3028     3002      -26     
+ Misses         94       92       -2     

Flag	Coverage Δ
unittests	97.02% <100.00%> (+0.03%)	:arrow_up:

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Impacted Files	Coverage Δ
agnpy/emission_regions/blob.py	91.24% <ø> (+0.27%)	:arrow_up:
agnpy/tests/test_emission_regions.py	100.00% <ø> (ø)
agnpy/spectra/spectra.py	96.27% <100.00%> (ø)
agnpy/tests/test_spectra.py	98.70% <100.00%> (ø)

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