docs: update plugin installation docs

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/rollbar/README.md

@@ -12,33 +12,25 @@ Website: [https://rollbar.com/](https://rollbar.com/)
 yarn add @backstage/plugin-rollbar
 ```
 
-3. Add plugin to the list of plugins:
+3. Add to the app `EntityPage` component:
 
-```ts
-// packages/app/src/plugins.ts
-export { plugin as Rollbar } from '@backstage/plugin-rollbar';
-```
-
-4. Add to the app `EntityPage` component:
-
-```ts
+```tsx
 // packages/app/src/components/catalog/EntityPage.tsx
-import { Router as RollbarRouter } from '@backstage/plugin-rollbar';
+import { EntityRollbarContent } from '@backstage/plugin-rollbar';
 
 // ...
-const ServiceEntityPage = ({ entity }: { entity: Entity }) => (
+const serviceEntityPage = (
   <EntityPageLayout>
-    // ...
-    <EntityPageLayout.Content
-      path="/rollbar"
-      title="Errors"
-      element={<RollbarRouter entity={entity} />}
-    />
+    ...
+    <EntityLayout.Route path="/rollbar" title="Rollbar">
+      <EntityRollbarContent />
+    </EntityLayout.Route>
+    ...
   </EntityPageLayout>
 );
 ```
 
-5. Setup the `app.config.yaml` and account token environment variable
+4. Setup the `app.config.yaml` and account token environment variable
 
 ```yaml
 # app.config.yaml
@@ -48,7 +40,7 @@ rollbar:
   accountToken: ${ROLLBAR_ACCOUNT_TOKEN}
 ```
 
-6. Annotate entities with the rollbar project slug
+5. Annotate entities with the rollbar project slug
 
 ```yaml
 # pump-station-catalog-component.yaml
@@ -60,7 +52,7 @@ metadata:
     rollbar.com/project-slug: project-name
 ```
 
-7. Run app with `yarn start` and navigate to `/rollbar` or a catalog entity
+6. Run app with `yarn start` and navigate to `/rollbar` or a catalog entity
 
 ## Features