coach user on getting intellisense if they have a `.tsx` file

[lino-levan]

Right now when we build .tsx pages, we rely on the deno.jsonc of Pyro. This should be configurable.

We should coach the user to include

{
  "compilerOptions": {
    "jsx": "react-jsx",
    "jsxImportSource": "https://esm.sh/[email protected]"
  }
}

at the bare minimum if they didn't already.

[lino-levan]

The version used in the imports should be aligned to the version pyro is built with.

[lino-levan]

Why even coach the user? We should just do this automatically.

[lino-levan]

we now automatically import deno.json(c)