Docker documentation and config.yaml must be updated

[mortenvw-hub]

In documentation:

docker run --rm -p 8000:8000 --add-host=host.docker.internal:host-gateway -v ./config.yaml:/app/config.yaml:ro -v ./stage:/app/stage:ro ghcr.io/nfdi4objects/n4o-graph-apis:main

In config:

# SPARQL endpoint and examples (required)
sparql:
  endpoint: http://host.docker.internal:3030/n4o
  examples:
    # examples given in files
    - queries/*.rq
    # example given in config file
    - name: List all classes
      query: |
        SELECT DISTINCT ?class WHERE { [] a ?class }  examples: