[documentation/Fix] add documentation for huggingface feature and fix ocr_predictor model loading

[felixdittrich92]

This PR:

• adds documentation how to use the huggingface integration (load / push)

• add tables for community models

• fix for passing a model itself directly to the predictor

Issue:
#426 (can be closed after merge)

• TODO: rework text in documentation

Review:
Code: @charlesmindee
Documentation: @fharper

Any feedback is welcome :)

[codecov]

Codecov Report

Merging #896 (07f4132) into main (43e5da3) will increase coverage by 0.00%.
The diff coverage is 95.23%.

@@           Coverage Diff           @@
##             main     #896   +/-   ##
=======================================
  Coverage   94.69%   94.70%           
=======================================
  Files         133      133           
  Lines        5377     5387   +10     
=======================================
+ Hits         5092     5102   +10     
  Misses        285      285           

Flag	Coverage Δ
unittests	94.70% <95.23%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
doctr/models/zoo.py	100.00% <ø> (ø)
doctr/models/detection/zoo.py	96.87% <90.00%> (+0.57%)	⬆️
doctr/models/detection/linknet/pytorch.py	99.00% <100.00%> (+0.01%)	⬆️
doctr/models/recognition/zoo.py	100.00% <100.00%> (ø)
doctr/transforms/modules/base.py	94.59% <0.00%> (ø)

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[charlesmindee]

Thanks for that, waiting for @fharper to review the doc part!

[charlesmindee]

is the "TODO: rework text in documentation" OK ?

[fharper]

As mentioned to @felixdittrich92, I'll review today or worse case tomorrow :)

[fharper]

Content LGTM (I wasn't able to generate the doc caused I still have issues on my M1 even following the steps from someone else)

[fharper]

@charlesmindee: can you validate and update the labels please.