DEV-628 - Add a new page discussing developer self service

[ZachGoldberg]

• We've been meaning to rebrand infra-modules as infra-catalog, this seemed as good a time to do that in docs as any.
• New page that covers what the catalog is, best practices using it

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 22, 2024 11:59pm

[gitguardian]

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