♻ Move project source files to top level from src, update Sentry dependency (#630)

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

backend/prestart.sh

@@ -0,0 +1,10 @@
+#! /usr/bin/env bash
+
+# Let the DB start
+python /app/app/backend_pre_start.py
+
+# Run migrations
+alembic upgrade head
+
+# Create initial data in DB
+python /app/app/initial_data.py