[landing][lib][web] Update to @rainbow-me/rainbowkit 2.0.7

Summary:
Figured I'd try upgrading this after working on D11948. I noticed in the Release Notes that it might fix Coinbase Wallet support on mobile.

Depends on D11948

Test Plan: For now I only tested that the RainbowKit stuff works locally. Testing Coinbase Wallet is tough in a local environment. I plan to try to test it after shipping this to production

Reviewers: ginsu

Reviewed By: ginsu

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D11949