convert wetty from submodule to normal directory

wetty/.github/workflows/stale.yml

@@ -0,0 +1,22 @@
+---
+name: Mark stale issues and pull requests
+on:
+  schedule:
+    - cron: '39 10 * * *'
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/stale@v8
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          stale-issue-message: 'Stale issue message'
+          stale-pr-message: 'Stale pull request message'
+          stale-issue-label: 'no-issue-activity'
+          stale-pr-label: 'no-pr-activity'
+          days-before-close: 21
+          days-before-stale: 365