chore: Post release modifications

[fg-mindee]

This PR introduces the following modifications:

• updated pypi badge in README
• updated documentation
• updated package version index
• updated CI release job

Any feedback is welcome!

[codecov]

Codecov Report

Merging #451 (b114c80) into main (369a787) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #451      +/-   ##
==========================================
+ Coverage   95.84%   95.87%   +0.02%     
==========================================
  Files          96       96              
  Lines        3997     3997              
==========================================
+ Hits         3831     3832       +1     
+ Misses        166      165       -1     

Flag	Coverage Δ
unittests	95.87% <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	91.97% <0.00%> (+0.61%)	⬆️

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[charlesmindee]

Thanks!