Remove link to external helm repository (#396)

Author: claudex

kubernetes/helm-chart/README.md

@@ -9,11 +9,8 @@ helm lint .
 # Package chart
 helm package .
 
-# Add repo
-helm repo add misp https://gitlab.com/api/v4/projects/64679397/packages/helm/stable
-
 # Install
-helm install misp/misp
+helm install misp ./misp-1.0.0.tgz
 ```
 
 ## Custom Scripts