Add `Rollup` bundler for the server

Change-Id: I38734b55ff80beeb9e0389b5a8e7c436a05477c3
diff --git a/.env.development b/.env.development
new file mode 100644
index 0000000..4a84496
--- /dev/null
+++ b/.env.development
@@ -0,0 +1 @@
+SECRET_KEY_BASE=test123