Documentation: Create a github workflow to fetch docs from talawa mobile app

[gautam-divyanshu]

What kind of change does this PR introduce?

Issue Number:

Fixes #866

Did you add tests for your changes?

Snapshots/Videos:

docs.mp4

If relevant, did you update the documentation?

Summary

Does this PR introduce a breaking change?

Other information

Have you read the contributing guide?

[github-actions]

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