feat: Add GitHub Pages website for browsing resources

- Add static website with pages for agents, prompts, instructions, skills, and collections
- Implement client-side fuzzy search across all resources
- Add file viewer modal with copy-to-clipboard and install-to-editor functionality
- Add Tools page for MCP server and future tools
- Add Samples page placeholder for copilot-sdk cookbook migration
- Add metadata JSON generation script (eng/generate-website-data.mjs)
- Add GitHub Actions workflow for automated Pages deployment
- Update package.json with website build scripts

.github/workflows/deploy-website.yml

@@ -0,0 +1,73 @@
+# GitHub Pages deployment workflow
+# Builds the website data and deploys to GitHub Pages
+
+name: Deploy Website to GitHub Pages
+
+on:
+  # Runs on pushes targeting the default branch
+  push:
+    branches: ["main"]
+    paths:
+      - 'website/**'
+      - 'agents/**'
+      - 'prompts/**'
+      - 'instructions/**'
+      - 'skills/**'
+      - 'collections/**'
+      - 'eng/generate-website-data.mjs'
+      - '.github/workflows/deploy-website.yml'
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+# 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"
+  cancel-in-progress: false
+
+jobs:
+  # Build job
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Generate website data
+        run: npm run website:build-data
+
+      - name: Setup Pages
+        uses: actions/configure-pages@v5
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: './website'
+
+  # Deployment job
+  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