feat: add docs sync trigger (#21)

Author: abrichr

.github/workflows/notify-docs.yml

@@ -0,0 +1,14 @@
+name: Notify docs
+on:
+  push:
+    branches: [main]
+jobs:
+  notify:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: peter-evans/repository-dispatch@v3
+        with:
+          token: ${{ secrets.DOCS_DISPATCH_TOKEN }}
+          repository: OpenAdaptAI/openadapt-maintenance
+          event-type: repo-updated
+          client-payload: '{"repo": "${{ github.repository }}", "sha": "${{ github.sha }}"}'