feat: Add Github Pages Connector

[akhilender-bongirwar]

Description

This PR introduces support for a new GitHub Pages connector that enables crawling and indexing content from GitHub Pages sites.

Related Issue(s) (provide if relevant)

fixes #2282
/claim #2282

Mental Checklist:

• All of the automated tests pass
• All PR comments are addressed and marked resolved
• If there are migrations, they have been rebased to latest main
• If there are new dependencies, they are added to the requirements
• If there are new environment variables, they are added to all of the deployment methods
• If there are new APIs that don't require auth, they are added to PUBLIC_ENDPOINT_SPECS
• Docker images build and basic functionalities work
• Author has done a final read through of the PR right before merge

Backporting (check the box to trigger backport action)

Note: You have to check that the action passes, otherwise resolve the conflicts manually and tag the patches.

• This PR should be backported (make sure to check that the backport attempt succeeds)

[vercel]

@akhilender-bongirwar is attempting to deploy a commit to the Danswer Team on Vercel.

A member of the Team first needs to authorize it.

[akhilender-bongirwar]

@Weves, please review : )

[akhilender-bongirwar]

@Weves, could you take a look.