chore(supernova): add screenshots and getting started to readme (#340)

* chore(supernova): add screenshots to readme

* release(supernova): update patch level for new screenshots

* fix(supernova): readme formatting

* chore(supernova): adds Getting Started section to readme

.changeset/tame-rivers-dress.md

@@ -0,0 +1,5 @@
+---
+"@cloudoperators/juno-app-supernova": patch
+---
+
+chore(supernova): add screenshots to readme

apps/supernova/README.md

@@ -3,7 +3,11 @@
 [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
 [![Built with Juno](https://cloudoperators.github.io/juno/built-with-juno.svg)](https://github.com/cloudoperators/juno)
 
-Supernova is an enhanced UI for Prometheus Alertmanager, offering several quality-of-life improvements:
+Supernova is an enhanced UI for Prometheus Alertmanager.
+
+![supernova_alerts](https://github.com/user-attachments/assets/5e3b4272-d12a-4524-9c6e-669d1dd32ffb)
+
+Supernova offers several quality-of-life improvements:
 
 - Predefined filter categories for quick, one-click filtering of the alerts list using label and regex combinations.
 - Configurable labels for flexible alert filtering.
@@ -21,6 +25,30 @@ Supernova is an enhanced UI for Prometheus Alertmanager, offering several qualit
 - Aggregation by customizable labels, replacing the current hardcoded region label.
 - Configurable URL patterns for automatic linking in labels (replacing the current hardcoded patterns).
 
+## Screenshots
+
+Alert detail:
+![supernova_alerts_details](https://github.com/user-attachments/assets/232059cd-61e6-4140-8d07-775c5145caaf)
+
+Silence information per alert:
+
+![supernova_alerts_details_silences](https://github.com/user-attachments/assets/33e192dd-759b-441c-8fd2-2b94164d7b74)
+
+## Getting Started
+
+### Docker image
+
+We publish a self-hostable docker image [in our registry](https://github.com/cloudoperators/juno/pkgs/container/juno-app-supernova). The README for it can be found [here in the docker folder](https://github.com/cloudoperators/juno/tree/main/apps/supernova/docker)
+
+### Dev mode
+
+To start Supernova in dev mode, make a copy of the included `secretProps_sample.js` file, rename it `secretProps.js` and enter your configuration options (see below). Then:
+
+```shell
+npm i
+npm run dev
+```
+
 ## Concepts
 
 ### Alerts