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/cache-config.yaml

@@ -4,7 +4,7 @@ release:
   namespace: testing
 tests:
   - it: "cache is configured correctly for valkey-cluster"
-    template: templates/gitea/config.yaml
+    template: templates/config.yaml
     set:
       valkey-cluster:
         enabled: true
@@ -19,7 +19,7 @@ tests:
             HOST=redis+cluster://:@gitea-unittests-valkey-cluster-headless.testing.svc.cluster.local:6379/0?pool_size=100&idle_timeout=180s&
 
   - it: "cache is configured correctly for valkey"
-    template: templates/gitea/config.yaml
+    template: templates/config.yaml
     set:
       valkey-cluster:
         enabled: false
@@ -34,7 +34,7 @@ tests:
             HOST=redis://:changeme@gitea-unittests-valkey-headless.testing.svc.cluster.local:6379/0?pool_size=100&idle_timeout=180s&
 
   - it: "cache is configured correctly for 'memory' when valkey (or valkey-cluster) is disabled"
-    template: templates/gitea/config.yaml
+    template: templates/config.yaml
     set:
       valkey-cluster:
         enabled: false
@@ -49,7 +49,7 @@ tests:
             HOST=
 
   - it: "cache can be customized when valkey (or valkey-cluster) is disabled"
-    template: templates/gitea/config.yaml
+    template: templates/config.yaml
     set:
       valkey-cluster:
         enabled: false