Minor corrections to DHA templates

I made a couple adjustments to the mapping for acdh:Resource --> dha:RepoObject:

The name of the template should have Resource so that it corresponds to the name of the class in ARCHE (RepoObject is the name of the corresponding class in DHA).
I have included the val attribute for dha:Concept ("/rdfProperty" implemented by @zozlak in https://github.com/acdh-oeaw/arche-oaipmh/issues/3).

acdh-oeaw / arche-docker-config