Dashboards not aware of kube-proxy

[maierlars]

The Dashboards do not work when accessed via kubectl proxy and http://localhost:8001/api/v1/namespaces/<namespace>/services/https:arango-deployment-operator:8528/proxy/. The reason for that is, that hardcoded url in the js-files are absolute, i.e. start with / and are not replaced by the proxy.
Hence login returns 404.

Possible solution: use a <base> tag to get the url prefix.