feat: run server functions on edge

apps/website/src/routes/api/newsletter/+server.ts

@@ -1,6 +1,10 @@
 import { NEWSLETTER_API_TOKEN, NEWSLETTER_LIST_ID } from '$env/static/private'
 import type { RequestHandler } from './$types'
 
+export const config = {
+    runtime: 'edge'
+}
+
 export const POST = (async ({ request, fetch }) => {
     const data: { email: string } = await request.json()
     const { email } = data