[Docs] Reformat README.md of all algorithms

[wangruohui]

1. Reformat READMEs following https://gist.github.com/zhouzaida/e3ccf34400d468ce7e8edb9ac3c499e8
2. update local hook for update model.yml
3. Ignore .pre-commit-config.yaml in build.yml, to avoid useless actions

[codecov]

Codecov Report

Merging #663 (1357683) into master (9c9d690) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #663      +/-   ##
==========================================
+ Coverage   80.49%   80.51%   +0.01%     
==========================================
  Files         198      198              
  Lines       11234    11234              
  Branches     1795     1795              
==========================================
+ Hits         9043     9045       +2     
+ Misses       1915     1914       -1     
+ Partials      276      275       -1     

Flag	Coverage Δ
unittests	80.48% <ø> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...ls/components/stylegan2/generator_discriminator.py	86.14% <0.00%> (+1.20%)	⬆️

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[ckkelvinchan]

The documentation looks fine. LGTM.