Completing documentation

[thuiop]

This PR is for documenting on the recent changes, including multiresolution and command line interface. It should be merged after #178 .
For now I updated some notebooks, splitted the "advanced features" notebook in two, and added notebook validation using nbval, as Mike Jarvis suggested.

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[thuiop]

@ismael-mendoza You may want to add something about the CLI in the documentation ?

[ismael-mendoza]

@ismael-mendoza You may want to add something about the CLI in the documentation ?

Thanks @thuiop for starting this, yes, I will add some docs for documentation soon

[codecov]

Codecov Report

Merging #179 (f54e080) into main (010c7dc) will decrease coverage by 0.64%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #179      +/-   ##
==========================================
- Coverage   86.20%   85.55%   -0.65%     
==========================================
  Files          13       13              
  Lines        1529     1530       +1     
==========================================
- Hits         1318     1309       -9     
- Misses        211      221      +10     

Flag	Coverage Δ
unittests	85.55% <100.00%> (-0.65%)	⬇️

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Impacted Files	Coverage Δ
btk/metrics.py	94.85% <ø> (ø)
btk/survey.py	93.26% <ø> (ø)
btk/draw_blends.py	84.82% <100.00%> (ø)
btk/measure.py	86.87% <100.00%> (-0.09%)	⬇️
btk/plot_utils.py	80.05% <100.00%> (-2.51%)	⬇️
btk/sampling_functions.py	64.90% <100.00%> (ø)

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