Updates docs for release

[yunchu]

Summary

• Added docs workflow for stable release
• Updated some docstrings
• Fixed some docs build errors

How to test

Checklist

• I have added unit tests to cover my changes.​
• I have added integration tests to cover my changes.​
• I have added the description of my changes into CHANGELOG.​
• I have updated the documentation accordingly

License

• I submit my code changes under the same MIT License that covers the project.
  Feel free to contact the maintainers if that's a concern.
• I have updated the license header for each file (see an example below).

# Copyright (C) 2023 Intel Corporation
#
# SPDX-License-Identifier: MIT

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[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.28 🎉

Comparison is base (37b62bb) 78.78% compared to head (c04984a) 79.06%.

Additional details and impacted files

@@                Coverage Diff                 @@
##           releases/1.2.0     #936      +/-   ##
==================================================
+ Coverage           78.78%   79.06%   +0.28%     
==================================================
  Files                 218      231      +13     
  Lines               25575    27271    +1696     
  Branches             5100     5611     +511     
==================================================
+ Hits                20148    21563    +1415     
- Misses               4262     4479     +217     
- Partials             1165     1229      +64     

Flag	Coverage Δ
macos-11_Python-3.8	78.11% <100.00%> (+0.33%)	⬆️
ubuntu-20.04_Python-3.8	79.04% <100.00%> (?)
windows-2019_Python-3.8	78.95% <100.00%> (+0.23%)	⬆️

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

Impacted Files	Coverage Δ
datumaro/cli/util/project.py	33.67% <ø> (ø)
...ugins/data_formats/common_semantic_segmentation.py	82.02% <ø> (ø)
datumaro/plugins/data_formats/imagenet.py	91.76% <ø> (ø)
datumaro/plugins/sampler/random_sampler.py	79.62% <ø> (ø)
...ns/data_formats/datumaro_binary/mapper/__init__.py	100.00% <100.00%> (ø)

... and 28 files with indirect coverage changes

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[vinnamkim]

Do you have a plan to use this in the near future?

[yunchu]

yes. once it merged, I can trigger this wf to check whether current docs build env can work on the GH actions-runner instance. after checking it, I will enable this job.

[vinnamkim]

LGTM.