refactor(structure): remove leading gitea directory (#958)

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.

Reviewed-on: https://gitea.com/gitea/helm-gitea/pulls/958
Reviewed-by: DaanSelen <daanselen@noreply.gitea.com>
Co-authored-by: Markus Pesch <markus.pesch@cryptic.systems>
Co-committed-by: Markus Pesch <markus.pesch@cryptic.systems>

.gitea/workflows/test-pr.yml

@@ -7,6 +7,7 @@ on:
   push:
     branches:
       - main
+      - v13
 
 env:
   # renovate: datasource=github-releases depName=helm-unittest/helm-unittest