Rename CRD group and version

Replace theodolite.com/v1 by theodolite.rocks/v1beta1.

Fix #201 (closed).

helm/benchmark-definitions/test/test-example-execution.yaml

-apiVersion: theodolite.com/v1
+apiVersion: theodolite.rocks/v1beta1
 kind: execution
 metadata:
   name: theodolite-test-execution