Add to config.example.yml

(cherry picked from commit 4a39f33006)

src/config/universal-config.interface.ts

@@ -12,5 +12,5 @@ export interface UniversalConfig extends Config {
    * this option can be disabled to boost server performance at the expense of
    * loading smoothness.
    */
-  inlineCriticalCss?;
+  inlineCriticalCss?: boolean;
 }