migrate: change repoURLs from GitHub to Gitea

Update all ArgoCD Application references to use Gitea (github0213.com)
instead of GitHub for K3S-HOME/applications repository.
Also update docusaurus to use gitea-creds for Image Updater write-back.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docusaurus/argocd.yaml

@@ -9,19 +9,19 @@ metadata:
     argocd-image-updater.argoproj.io/image-list: docusaurus=zot0213.kro.kr/docusaurus:latest
     argocd-image-updater.argoproj.io/docusaurus.update-strategy: digest
     argocd-image-updater.argoproj.io/docusaurus.pull-secret: pullsecret:argocd/zot-creds
-    argocd-image-updater.argoproj.io/write-back-method: git:secret:argocd/github-creds
+    argocd-image-updater.argoproj.io/write-back-method: git:secret:argocd/gitea-creds
     argocd-image-updater.argoproj.io/git-branch: main
     argocd-image-updater.argoproj.io/docusaurus.helm.image-tag: image.tag
 spec:
   project: default
   sources:
-  - repoURL: https://github.com/K3S-HOME/web-apps.git
+  - repoURL: https://github0213.com/K3S-HOME/web-apps.git
     targetRevision: main
     path: charts/web-app
     helm:
       valueFiles:
       - $values/docusaurus/helm-values.yaml
-  - repoURL: https://github.com/K3S-HOME/applications.git
+  - repoURL: https://github0213.com/K3S-HOME/applications.git
     targetRevision: main
     ref: values
   destination: