[FEATURE] Adds github action to generate doc

[anshulguleria]

Added github action install dependencies required to generate
documentation and then run the documentation generator.

As a final step publish the changes to gh-pages branch which will be
the source for github documentation.

Adds badge for doc-generator github action

closes: #1494

Summary

Test plan

Does this PR introduce a breaking change?

• Yes
• No

Other information

[ahnpnl]

Just side information, since we start using github actions, I think we can do a POC for #664 on github actions CI against Travis for our CI

[anshulguleria]

@ahnpnl Sure. I recently did a similar thing in one of my packages.

https://github.com/amzn/git-commit-template/blob/master/.github/workflows/npmpublish.yml

Let me know that workflow is fine. I can add a similar thing for this.

This is how my workflow happens: https://github.com/amzn/git-commit-template/blob/master/SETUP.md#releasing-the-changes

[ahnpnl]

@ahnpnl Sure. I recently did a similar thing in one of my packages.

https://github.com/amzn/git-commit-template/blob/master/.github/workflows/npmpublish.yml

Let me know that workflow is fine. I can add a similar thing for this.

This is how my workflow happens: https://github.com/amzn/git-commit-template/blob/master/SETUP.md#releasing-the-changes

@kulshekhar this is something you would love
@anshulguleria I think it is also possible to create a release in GitHub release page with this too, probably with https://github.com/release-it/release-it ?

[coveralls]

Pull Request Test Coverage Report for Build 4407

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.944%

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Totals
Change from base Build 4406:	0.0%
Covered Lines:	1160
Relevant Lines:	1195

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💛 - Coveralls

[kulshekhar]

Thanks @anshulguleria !