refactor: large refactor around monorepo

Just a commit point while I'm testing stuff. Already decided at this
point to simplify and revert away from PayloadCMS.

apps/payload/tests/int/api.int.spec.ts

@@ -0,0 +1,20 @@
+import { getPayload, Payload } from 'payload'
+import config from '@/payload.config'
+
+import { describe, it, beforeAll, expect } from 'vitest'
+
+let payload: Payload
+
+describe('API', () => {
+  beforeAll(async () => {
+    const payloadConfig = await config
+    payload = await getPayload({ config: payloadConfig })
+  })
+
+  it('fetches users', async () => {
+    const users = await payload.find({
+      collection: 'users',
+    })
+    expect(users).toBeDefined()
+  })
+})