Add manual GitHub Pages deployment workflow

- Create workflow for manual deployment to gh-pages branch
- Include environment selection (production/staging)
- Use official GitHub Pages actions for secure deployment
- Add proper permissions and concurrency controls

Author: NangiDev

.github/workflows/deploy.yml

@@ -0,0 +1,55 @@
+name: Deploy to GitHub Pages
+
+on:
+  workflow_dispatch:
+    inputs:
+      environment:
+        description: 'Deployment environment'
+        required: true
+        default: 'production'
+        type: choice
+        options:
+        - production
+        - staging
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        
+      - name: Setup Pages
+        uses: actions/configure-pages@v4
+        
+      - name: Build site
+        run: |
+          echo "Building static site..."
+          # Since this is a static site, we just need to prepare the files
+          # Remove any development-only files if needed
+          find . -name ".DS_Store" -delete 2>/dev/null || true
+          
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: .
+
+  deploy:
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    runs-on: ubuntu-latest
+    needs: build
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4