refac(structure): remove leading gitea directory

The following pull request removes the `gitea` directory. With regard to
maintaining act_runners in a separate git repository or helm chart, this
additional directory becomes redundant.

unittests/helm/dependency-checks/customization-integrity-postgresql.yaml

@@ -65,14 +65,14 @@ tests:
           name: gitea-unittests-postgresql
           namespace: testing
   - it: "[gitea] connects to postgresql service"
-    template: templates/gitea/config.yaml
+    template: templates/config.yaml
     asserts:
       - documentIndex: 0
         matchRegex:
           path: stringData.database
           pattern: HOST=gitea-unittests-postgresql.testing.svc.cluster.local:1234
   - it: "[gitea] connects to configured database"
-    template: templates/gitea/config.yaml
+    template: templates/config.yaml
     asserts:
       - documentIndex: 0
         matchRegex: