Update documentation + general maintenance

[HealthyPear]

Summary description

• simplified README (all info are stored in the docs) with updates from current auxiliary services
• added support for backup documentation on readthedocs (still no automatic notebook execution, though)
• added many more benchmarks
• updated all benchmarking results to the latest reference analysis

Requirements

• [x] #59
• [x] #77
• [x] #79
• [x] #83
• [x] #76
• [x] #101
• [x] check that documentation is up-to-date for release v0.4.0

[review-notebook-app[bot]]

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Codecov Report

Merging #62 (8a1bd70) into master (fa3d622) will increase coverage by 0.21%. The diff coverage is 70.00%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
+ Coverage   36.81%   37.03%   +0.21%     
==========================================
  Files          18       19       +1     
  Lines        1798     1801       +3     
==========================================
+ Hits          662      667       +5     
+ Misses       1136     1134       -2     

Impacted Files	Coverage Δ
protopipe/perf/utils.py	24.52% <ø> (ø)
protopipe/scripts/__init__.py	100.00% <ø> (ø)
protopipe/scripts/data_training.py	85.56% <33.33%> (ø)
protopipe/perf/temp.py	23.52% <50.00%> (-2.95%)	:arrow_down:
protopipe/perf/__init__.py	100.00% <100.00%> (ø)
protopipe/pipeline/event_preparer.py	69.34% <100.00%> (+0.90%)	:arrow_up:
protopipe/pipeline/temp.py	81.15% <100.00%> (ø)
protopipe/pipeline/utils.py	50.64% <100.00%> (+0.31%)	:arrow_up:
... and 1 more

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