Add redirect from /github to registration page for GitHub Pages

[accesswatch]

This PR adds a redirect at /github/index.html so that users visiting community-access.org/github are sent to the registration page. This is implemented using a meta refresh for GitHub Pages compatibility.

[github-actions]

Peer Review Assigned

Hi @accesswatch! Your PR has been automatically paired with @taylorarndt for peer review.

For @taylorarndt:

This is a great opportunity to practice code review skills! Here's what to look for:

Content Quality:

• Does the change accomplish what the issue describes?
• Is the writing clear and helpful?
• Are there any typos or grammar issues?

Accessibility:

• Proper heading hierarchy (H1 → H2 → H3, no skips)?
• Descriptive link text (not "click here")?
• Alt text on images?
• [TODO] markers removed?

Documentation:

• Code blocks are properly formatted?
• Tables have headers?
• References/links work correctly?

Review Guidelines:

• Be kind and constructive
• Suggest improvements, don't just point out problems
• Ask questions if something is unclear
• Approve when ready or request changes with explanation

Resources:

• How to Review PRs
• Writing Good Review Comments

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