chore: turn on cpex again tmp for testing

Author: ravern

website/src/featureFlags.ts

@@ -1,6 +1,6 @@
 /* eslint-disable import/prefer-default-export */
 
 /** Enable Course Planning Exercise */
-export const enableCPEx = false;
+export const enableCPEx = true;
 
 export const showCPExTab = false;