Enforcing RouteRefs more: docs, templates, types

docs/getting-started/structure-of-a-plugin.md

@@ -43,13 +43,19 @@ In the root folder you have some configuration for typescript and jest, the test
 In the `src` folder we get to the interesting bits. Check out the `plugin.ts`:
 
 ```jsx
-import { createPlugin } from '@backstage/core';
+import { createPlugin, createRouteRef } from '@backstage/core';
 import ExampleComponent from './components/ExampleComponent';
 
-export default createPlugin({
-  id: 'new-plugin',
+export const rootRouteRef = createRouteRef({
+  icon: () => null,
+  path: '/{{ id }}',
+  title: '{{ id }}',
+});
+
+export const plugin = createPlugin({
+  id: '{{ id }}',
   register({ router }) {
-    router.registerRoute('/new-plugin', ExampleComponent);
+    router.addRoute(rootRouteRef, ExampleComponent);
   },
 });
 ```