Remove reference to nonexistent /guides/wasm.md

[jasikpark]

Changes

• Removes the link to /guides/wasm
• Maybe we could instead actually flesh out what using wasm with astro means? Is this something where we could pull prior art from https://github.com/snowpackjs/astro-repl?

Testing

Docs

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[natemoo-re]

LGTM! I think next will be able to point to Vite's docs on WASM instead!