Update sveletekit example

[mfridman]

Suggestion to using vite instead of svelte-kit. This will be deprecated in the future, and things work quite nicely with vite.

sveltejs/kit#5332

Otherwise folks running the example might run into:

svelte-kit dev is no longer available - use vite dev instead

1. Install vite as a devDependency with npm/pnpm/etc
2. Create a vite. config. js with the @sveltejs/kit/vite plugin (see below)
3. Update your package.json scripts to reference 'vite dev' instead of `svelte-kit dev'

// vite. config.js
import { sveltekit } from '@sveltejs/kit/vite';

/** @type fimport('vite').UserConfig} */
  const config = {
  plugins: [sveltekit()]
};

export default config;

[timostamm]

We are tracking this in https://linear.app/bufbuild/issue/TCN-336/update-sveltekit-example