[SEO] Redirect "Contact GitHub" footer link to Support site

[skullface]

This PR updates the redirect in place for "Contact GitHub" to minimize end-user redirects to have a positive impact on SEO.

Why:

https://github.com/github/SEO/issues/64

What's being changed:

• Old: https://support.github.com/contact
• New: https://support.github.com

Check off the following:

• I have reviewed my changes in staging. (look for the deploy-to-heroku link in your pull request, then click View deployment)
• For content changes, I have reviewed the localization checklist
• For content changes, I have reviewed the Content style guide for GitHub Docs.

[github-actions]

👋 Hey there spelunker. It looks like you've modified some files that we can't accept as contributions. The complete list of files we can't accept are:
translations/**
lib/rest/static/**
.github/workflows/**
.github/CODEOWNERS
translations/**
assets/fonts/**
data/graphql/**
lib/graphql/**
lib/redirects/**
lib/rest/**
lib/webhooks/**

You'll need to revert all of the files you changed in that list using GitHub Desktop or git checkout origin/main <file name>. Once you get those files reverted, we can continue with the review process.

[SMAKSS]

Hi there, thanks for the PR, as the bot mentioned earlier the lib/redirects/* can not be modified by any PR, so AFAIK sadly no one can accept this change to the code base. Unless the core team change this by themselves.

[skullface]

Thanks @SMicheal + @SMAKSS! I’ll notify the core team ^—^

[janiceilene]

Thanks for opening a PR @skullface! This was discussed in Slack and can be merged in once the engineering team takes a look and gives approval 💖

[heiskr]

👍🏼 Seems fine to me.

manually checked and overridden

[github-actions]

👋 Hey there spelunker. It looks like you've modified some files that we can't accept as contributions. The complete list of files we can't accept are:
translations/**
lib/rest/static/**
.github/workflows/**
.github/CODEOWNERS
translations/**
assets/fonts/**
data/graphql/**
lib/graphql/**
lib/redirects/**
lib/rest/**
lib/webhooks/**

You'll need to revert all of the files you changed in that list using GitHub Desktop or git checkout origin/main <file name>. Once you get those files reverted, we can continue with the review process.

dismissed