chore: Post release modifications

[fg-mindee]

This PR introduces the following modifications:

• updated pypi badge in README
• updated documentation
• updated package version index

Any feedback is welcome!

[codecov]

Codecov Report

Merging #520 (8225034) into main (51663dd) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #520      +/-   ##
==========================================
+ Coverage   95.36%   95.38%   +0.02%     
==========================================
  Files         109      109              
  Lines        4183     4183              
==========================================
+ Hits         3989     3990       +1     
+ Misses        194      193       -1     

Flag	Coverage Δ
unittests	95.38% <ø> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...dels/detection/differentiable_binarization/base.py	91.82% <0.00%> (+0.62%)	⬆️

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[charlesmindee]

Thanks!