docs: fix broken link in README

[sukrucildirr]

Fixed broken link in README.md

[vercel]

@sukrucildirr is attempting to deploy a commit to the Ephemera Team on Vercel.

A member of the Team first needs to authorize it.

[macroscopeapp]

Fix broken XMTP community code of conduct link in README.md to point to vision/community/code-of-conduct.md

Update the hyperlink in README.md that references the XMTP community code of conduct to use the vision/community/code-of-conduct.md path instead of docs/community/code-of-conduct.md.

📍Where to Start

Start with the hyperlink update in README.md.

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Macroscope summarized e76dcc6.