Fix Typescript, CORS errors

[Wadu436]

This PR fixes the following errors I encountered during the getting started

1. TS didn't compile (preprocess plugin was not registered in svelte.config.js)

Internal server error: /src/routes/+page.svelte:2:12 Unexpected token
  Plugin: vite-plugin-svelte
  File: /src/routes/+page.svelte:2:12
   1 |  <script lang="ts">import { Container, Display, Sprite, Panel } from "~/components";
   2 |  import type { PageData } from "./$houdini";
                    ^
   3 |  export let data: PageData;
   4 |  

3. CORS error (I don't know what caused the error, but it's fixed by pointing the client at a relative url rather than an absolute one)
   

[changeset-bot]

⚠️ No Changeset found

Latest commit: f897bc1

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR