feat: add sitemaps and SEO related headers

[moonmeister]

There's more we could do but this gets the ball rolling. Robots are currently set to NOT index. We'll switch this when we're ready to go live.

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• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • https://app.asana.com/0/0/1208642324781616

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[kellenmace]

Looks great overall! Thanks for doing this! I left a few review comments.

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