docs: add canonical IA landing + first-pass core pages

docs/02-quickstart.md

@@ -0,0 +1,14 @@
+# Quickstart (self-host with Docker Compose)
+
+This page is a pointer to the canonical quickstart in the repo root README.
+
+- Canonical quickstart: [`README.md#quick-start-self-host-with-docker-compose`](../README.md#quick-start-self-host-with-docker-compose)
+
+## Verify it works
+After `docker compose up`:
+- Backend health: `http://localhost:8000/healthz` returns `{ "ok": true }`
+- Frontend: `http://localhost:3000`
+
+## Common gotchas
+- `NEXT_PUBLIC_API_URL` must be reachable from your browser (host), not just from inside Docker.
+- If you are not configuring Clerk locally, ensure Clerk env vars are **unset/blank** so Clerk stays gated off.