docs: add amontoison as a contributor for ideas, code, and 5 more

[allcontributors]

Adds @amontoison as a contributor for ideas, code, doc, maintenance, research, review, talk.

This was requested by gdalle in this comment

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.20%. Comparing base (20799cf) to head (ac250fc).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #332      +/-   ##
==========================================
+ Coverage   95.25%   99.20%   +3.95%     
==========================================
  Files          21       21              
  Lines        2151     2151              
==========================================
+ Hits         2049     2134      +85     
+ Misses        102       17      -85     

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