Add GEO guide

[ethanpalm]

Documentation changes

This PR adds a GEO guide.

Part of https://linear.app/mintlify/issue/DOC-121/seogeo-best-practices

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[tiffany-mintlify]

more philosophical question — should we encourage people to have a FAQs page that has direct answers? this is a product question as well, like the community forum / support use case

[ethanpalm]

Historically, FAQ pages have been dismissed by tech writers since you can't ever know every question someone is going to ask and people didn't really search in full questions.

But now people are asking full questions of these tools, so FAQs might be better.

Kind of a frontier and a shift in best practice so I don't know what's actually going to perform best. Reflexively, I don't want to encourage FAQ pages, but they might now be way more valuable than they were in the past.