Add configuration option to disable inlined CSS in SSR HTML

When inlining CSS, Angular Universal needs to extract critical styles.
This seems to take up a significant chunk of processing time.

However, loading may appear less smooth when this feature is disabled.

Added to the configuration to make it easier to A/B test this without a full re-build.

server.ts

@@ -116,6 +116,7 @@ export function app() {
   server.engine('html', (_, options, callback) =>
     ngExpressEngine({
       bootstrap: ServerAppModule,
+      inlineCriticalCss: environment.universal.inlineCriticalCss,
       providers: [
         {
           provide: REQUEST,