doc: clean up

README.md

@@ -5,16 +5,22 @@ Helm's [documentation](https://helm.sh/docs) to get started.
 
 Once Helm has been set up correctly, add the repo as follows:
 
-  helm repo add viseron https://carlosrodfern.github.io/viseron-helm-chart
+```sh
+helm repo add viseron https://carlosrodfern.github.io/viseron-helm-chart
+```
 
 If you had already added this repo earlier, run `helm repo update` to retrieve
 the latest versions of the packages.  You can then run `helm search repo
 viseron` to see the charts.
 
 To install the viseron chart:
 
-    helm install my-viseron viseron/viseron
+```sh
+helm install my-viseron viseron/viseron
+```
 
 To uninstall the chart:
 
-    helm delete my-viseron
+```sh
+helm delete my-viseron
+```