chore: Add pointer to troubleshooting when nonce prevents script execution

closes #5718

app/env.ts

@@ -8,4 +8,10 @@ declare global {
 
 const env = window.env;
 
+if (!env) {
+  throw new Error(
+    "Config could not be be parsed. \nSee: https://docs.getoutline.com/s/hosting/doc/troubleshooting-HXckrzCqDJ#h-config-could-not-be-parsed"
+  );
+}
+
 export default env;