Update the Grafana Dashboard (#4680)

Co-authored-by: Frank Elsinga <frank@elsinga.de>

README.md

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+## Visualize using Grafana
+
+To import the sample Grafana dashboard, follow these steps:
+
+1. Download the dashboard file `uptime-kuma.json`.
+2. Open your Grafana instance in a web browser.
+3. Log in to Grafana with your username and password.
+4. Click on the "plus" icon in the left sidebar to open the "Create" menu.
+5. Select "Import" from the "Create" menu.
+6. Click on the "Choose File" button and select the .json file that you downloaded in step 1.
+7. Click on the "Load" button to begin the import process.
+8. If prompted, select prometheus as the data source that you want to use with the dashboard.
+9. Review the dashboard and click on the "Import" button to complete the process.
+
+You should now see the imported dashboard listed in the "Dashboards" section of the left sidebar. You can click on the
+dashboard to view it.
+
+
+### Post Configuration
+
+Now after the Dashboard was imported successfully we have to tell Grafana wich Datasource and Prometheus Job is the right one to use. To do so, select the right Datasource, Job and Instance one the Dropdown menus at the top left of the dashboard. Right after your selection the dashboard should update automatically and should now display your data.
+
+Additionally there is a hyperlink on the top right hand side which you can configure to bring you right to your Uptime-Kuma instance. To do so, klick at the Gear-Icon in the top left bar and navigate to Links. Klick on the 'Uptime-Kuma Instance'-Link and paste your own Instance-URL