Static export: do not export admin

- Changed Node.js version from 20 to 22 in the build workflow.
- Added a step to remove the admin folder from static export before building.

Author: alexbaumgertner

.github/workflows/build.yml

@@ -15,11 +15,14 @@ jobs:
       - name: Node Setup
         uses: actions/setup-node@v3
         with:
-          node-version: '20'
+          node-version: '22'
 
       - name: Install dependencies
         run: npm install
 
+      - name: Remove admin folder from static export
+        run: rm -rf ./src/app/admin
+
       - name: Build and Static HTML Export
         run: npm run build
         env: