Neon / portal template support (#713)

TODOs:
- [x] Do restart when checkout / restore if there is a DB
- [x] List all branches (branch id, name, date)
- [x] Allow checking out versions with no DB
- [x] safeguard to never delete main branches
- [x] create app hook for neon template
- [x] weird UX with connector on configure panel
- [x] tiny neon logo in connector
- [x] deploy to vercel
- [x] build forgot password page
- [x] what about email setup
- [x] lots of imgix errors
- [x] edit file - db snapshot
- [x] DYAD_DISABLE_DB_PUSH
- [ ] update portal doc
- [x] switch preview branch to be read-only endpoint
- [x] disable supabase sys prompt if neon is enabled
- [ ] https://payloadcms.com/docs/upload/storage-adapters
- [x] need to use main branch...

Phase 2?
- [x] generate DB migrations

e2e-tests/helpers/test_helper.ts

@@ -481,11 +481,11 @@ export class PageObject {
   }
 
   locateLoadingAppPreview() {
-    return this.page.getByText("Loading app preview...");
+    return this.page.getByText("Preparing app preview...");
   }
 
   locateStartingAppPreview() {
-    return this.page.getByText("Starting up your app...");
+    return this.page.getByText("Starting your app server...");
   }
 
   getPreviewIframeElement() {