moved login component; improved documentation; other minor improvements

src/main.ts

@@ -5,16 +5,10 @@ import { createApplication } from '@angular/platform-browser';
 import { createCustomElement } from '@angular/elements';
 import { environment } from './environments/environment';
 
-createApplication(appConfig).then((app) => {
-  const el = createCustomElement(App, { injector: app.injector });
-  customElements.define('frontend-plugin-demo', el);
-  return app;
-})
-// bootstrapPhoenixPluginCustomElement(App, 'frontend-plugin-demo', appConfig)
+bootstrapPhoenixPluginCustomElement(App, 'frontend-plugin-demo', appConfig)
 .then((app) => {
-  //if development:
   if(!environment.production)
-    return app.bootstrap(App);
+    return app!.bootstrap(App);
   else
     return app;
 });