Split CI (no benchmarks on PR) and extend docs

[gdalle]

CI

• On PRs: all tests and a documentation without benchmarks
• On main: all tests and a documentation with benchmarks

Docs

• Better analysis of alternatives
• Better background info
• Roadmap

Misc

• Logo in the README

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -13.25 ⚠️

Comparison is base (a302d13) 86.63% compared to head (655c2b8) 73.39%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #16       +/-   ##
===========================================
- Coverage   86.63%   73.39%   -13.25%     
===========================================
  Files          19       19               
  Lines         479      451       -28     
===========================================
- Hits          415      331       -84     
- Misses         64      120       +56     

see 14 files with indirect coverage changes

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