Use set-up-environment action in pages workflow

.github/workflows/pages.yml

@@ -3,7 +3,7 @@ name: Deploy estimator Pages
 on:
   # Runs on pushes targeting the default branch
   push:
-    branches: ["main"]
+    branches: ['main']
 
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
@@ -17,20 +17,18 @@ permissions:
 # Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
 # However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
 concurrency:
-  group: "pages"
+  group: 'pages'
   cancel-in-progress: false
 
 jobs:
   # Build job
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - name: Setup Node
-        uses: actions/setup-node@v4
-        with:
-          node-version: '18'
-      - run: npm install
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Set up environment
+        uses: ./.github/actions/set-up-environment
       - name: Build app
         run: npm run build
       - name: Upload artifact