Remove docs extra

[codesue]

What does this pull request do?

Removes the docs extra introduced in #275 since it breaks the release build.

ERROR    HTTPError: 400 Bad Request from https://test.pypi.org/legacy/          
         Invalid value for requires_dist. Error: Can't have direct dependency:  
         "tensorflow-docs @ git+https://github.com/tensorflow/docs ; extra ==   
         'docs'"     

How did you test this change?

pytest model_card_toolkit

How did you document this change?

n/a

Before submitting

Before submitting a pull request, please be sure to do the following:

• Read the How to Contribute guide if this is your first contribution.
• Open an issue or discussion topic to discuss this change.
• Write new tests if applicable.
• Update documentation if applicable.

[casassg]

won't this break the TF website generation? Not sure how that is being generated...

[codesue]

No, tensorflow_docs was never listed as a dependency. Here are the dependencies from 1.3: https://github.com/tensorflow/model-card-toolkit/blob/v1.3.0/setup.py#LL31-L42. It's needed to build the docs locally with python tools/build_api_docs.py.

I'm not sure exactly how the docs are being generated for the website yet, e.g. whether internal or tied to a TensorFlow release, but I'm following up on this.

[codesue]

Apparently the docs are built internally at Google in a manual process.