REFACTOR(gitea): move from applications repo

- Add gitea Application manifests
- Update repoURL to reference platform repo
- Include helm-values, kustomization, redirect configs

gitea/kustomization.yaml

@@ -0,0 +1,5 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+- redirect.yaml
+namespace: gitea