Record CSS IDs and selectors

[ethanpalm]

Documentation changes

This PR lists all of our CSS IDs and selectors.

Closes https://linear.app/mintlify/issue/DOC-33/record-all-of-our-css-ids-and-selectors

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[dino475]

LGTM but adding Sam since he gave me the list of CSS selectors!

[dks333]

these css selectors & ids are updated once a while, here are the full list for future reference

selectors: https://github.com/mintlify/mint/blob/9a798713bad4aa7fd2590ae852bd199fb182a0a3/apps/client/src/lib/local/selectors.ts#L1
ids: https://github.com/mintlify/mint/blob/9a798713bad4aa7fd2590ae852bd199fb182a0a3/apps/client/src/lib/local/identifiers.ts#L3