Readme updates

README.md

@@ -11,7 +11,14 @@
 
 Developer-friendly incident response with brilliant Slack integration.
 
-<img width="60%" src="screenshot.png">
+<table>
+  <tbody>
+    <tr>
+      <td width="60%"><img width="100%" src="screenshot.png"></td>
+      <td><div align="center"><a href="https://grafana.com/docs/oncall/latest/mobile-app/">Android & iOS</a>:</div><br><img height="100%" src="screenshot_mobile.png"></td>
+    </tr>
+  </tbody>
+</table>
 
 - Collect and analyze alerts from multiple monitoring systems
 - On-call rotations based on schedules

dev/README.md

@@ -40,7 +40,7 @@ environment variable.
    out/disable which components are run in Docker.
 3. Open Grafana in a browser [here](http://localhost:3000/plugins/grafana-oncall-app) (login: `oncall`, password: `oncall`).
 4. You should now see the OnCall plugin configuration page. You may safely ignore the warning about the invalid
-   plugin signature. When opening the main plugin page, you may also ignore warnings about version mismatch and lack of
+   plugin signature. Set "OnCall backend URL" as "http://host.docker.internal:8080". When opening the main plugin page, you may also ignore warnings about version mismatch and lack of
    communication channels.
 5. Enjoy! Check our [OSS docs](https://grafana.com/docs/grafana-cloud/oncall/open-source/) if you want to set up Slack,
    Telegram, Twilio or SMS/calls through Grafana Cloud.