- add org.label-schema LABELs for version, build-date, vcs-url

So far, we have used TLS certs from eurac's IT. Now, we (re-)use k8s
infrastructure (in particular the kube-lego add-on) and let kube-lego
- request/renew TLS certificates
- manage the certificate within a k8s secret
We then make this k8s secret available to our nginx and configure nginx
to use it.

We also got rid of internal TLS communication between ingress and the
apps avoiding the necessity to (re-)create valid/self-signed certs. The
overhead seemed unnecessary.

Note: using HTTP(!) over port 443 for internal communication (Shibboleth mishap)

Fix #62

- sitemaps are now generated in the entrypoint script

started cleanup of it

files

https://github.com/ufal/lindat-aai-discovery/issues/6 has been fixed, so my inline fix can be removed

- edited nginx conf to point to dspace container
- merged dspace and tomcat containers
- fixed https://github.com/ufal/clarin-dspace/issues/782 locally