Moved build_docs.py and BUILD into /tools/docs/

[hp77-creator]

Description

Brief Description of the PR:
To supplement the changes made in the location of files in docs/ to /tools/docs/

Fixes #2161

Type of change

• Bug fix
• New Tutorial
• Updated or additional documentation
• Additional Testing
• New Activation and the changes conform to the activation contribution guidelines
• New Callback and the changes conform to the callback contribution guidelines
• New Image addition and the changes conform to the image op contribution guidelines
• New Layer and the changes conform to the layer contribution guidelines
• New Loss and the changes conform to the loss contribution guidelines
• New Metric and the changes conform to the metric contribution guidelines
• New Optimizer and the changes conform to the optimizer contribution guidelines
• New RNN Cell and the changes conform to the rnn contribution guidelines
• New Seq2seq addition and the changes conform to the seq2seq contribution guidelines
• New Text addition and the changes conform to the text op contribution guidelines

Checklist:

• I've properly formatted my code according to the guidelines
  • By running Black + Flake8
  • By running pre-commit hooks
• This PR addresses an already submitted issue for TensorFlow Addons
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• This PR contains modifications to C++ custom-ops

How Has This Been Tested?

If you're adding a bugfix or new feature please describe the tests that you ran to verify your changes:
*

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[hp77-creator]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[seanpmorgan]

Per discussion in #2161 please update the documentation in this PR

[hp77-creator]

Per discussion in #2161 please update the documentation in this PR

Regarding that I had doubt, Shall I completely remove the documentation related with build_docs.py in docs/ and make a new documentation in tools/docs/ like it was in docs/ ?

[Harsh188]

Update docker/sanity_check.Dockerfile RUN python docs/build_docs.py to RUN python tools/build_docs.py. This should fix the build docs failure.

[WindQAQ]

Hi, thanks for contribution! We also have to modify this line
https://github.com/tensorflow/addons/blob/master/tools/docker/sanity_check.Dockerfile#L97 to

RUN python tools/docs/build_docs.py

[WindQAQ]

Revert this change.

[hp77-creator]

on it. thanks!

[hp77-creator]

@WindQAQ please review the PR

[WindQAQ]

Thanks!

stale