[Fixes / docs] Add more vocabs / Fix Style / HF hub / API Dep

[felixdittrich92]

This PR:

• adds some more vocabs and updated doc
• fix HF hub upload (increased to >=0.20)
• fix style
• remove onnx constraint
• fix api dep (TF needs py 3.9)
• Add two new custom models to the docs list

Any feedback is welcome 🤗

[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (5105f98) 95.76% compared to head (3540e11) 95.79%.

Files	Patch %	Lines
doctr/io/elements.py	33.33%	2 Missing ⚠️
doctr/models/builder.py	0.00%	1 Missing ⚠️
doctr/models/recognition/parseq/pytorch.py	0.00%	1 Missing ⚠️
doctr/models/recognition/parseq/tensorflow.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1412      +/-   ##
==========================================
+ Coverage   95.76%   95.79%   +0.03%     
==========================================
  Files         155      155              
  Lines        6942     6950       +8     
==========================================
+ Hits         6648     6658      +10     
+ Misses        294      292       -2     

Flag	Coverage Δ
unittests	95.79% <87.17%> (+0.03%)	⬆️

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[felixdittrich92]

Some minor stuff bundled into the PR

[felixdittrich92]

@odulcy-mindee are you fine if we fix the mypy issues in another PR ? Otherwise it blows up more and more 😅

[odulcy-mindee]

@odulcy-mindee are you fine if we fix the mypy issues in another PR ? Otherwise it blows up more and more 😅

Yeah, that's fine 👍