Use yarn within pages deployment

Author: deven96

.github/workflows/pages.yml

@@ -16,8 +16,9 @@ jobs:
       - name: Install and Build 🔧 # This example project is built using npm and outputs the result to the 'build' folder.
         working-directory: web/ahnlich-web
         run: |
-          npm ci --legacy-peer-deps
-          npm run build
+          npm install -g yarn
+          yarn ci --legacy-peer-deps
+          yarn run build
           touch build/.nojekyll
           echo "ahnlich.tech" >> build/CNAME