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/config/server-section_domain.yaml

@@ -4,7 +4,7 @@ release:
   namespace: testing
 tests:
   - it: "[default values] uses ingress host for DOMAIN|SSH_DOMAIN|ROOT_URL"
-    template: templates/gitea/config.yaml
+    template: templates/config.yaml
     asserts:
       - documentIndex: 0
         matchRegex:
@@ -22,7 +22,7 @@ tests:
   ################################################
 
   - it: "[no ingress hosts] uses gitea http service for DOMAIN|SSH_DOMAIN|ROOT_URL"
-    template: templates/gitea/config.yaml
+    template: templates/config.yaml
     set:
       ingress:
         hosts: []
@@ -43,7 +43,7 @@ tests:
   ################################################
 
   - it: "[provided via values] uses that for DOMAIN|SSH_DOMAIN|ROOT_URL"
-    template: templates/gitea/config.yaml
+    template: templates/config.yaml
     set:
       gitea.config.server.DOMAIN: provided.example.com
       ingress: