Replace Jekyll site with modern Vite-based HIP browser

- Add Vite + vanilla JS site with search, filtering, dark mode,
  pipeline visualization, and GitHub discussion integration
- Fetch and display draft HIPs from open PRs alongside merged HIPs
- Add GitHub Actions workflow for automated deployment to Pages
- Remove Jekyll configuration, layouts, includes, and templates

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Michael Garber <michael.garber@hashgraph.com>

Author: mgarbs

.github/workflows/deploy-site.yml

@@ -0,0 +1,63 @@
+name: Deploy Site
+
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Harden the runner (Audit all outbound calls)
+        uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
+        with:
+          egress-policy: audit
+
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+
+      - name: Setup Node.js
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        with:
+          node-version: "20"
+
+      - name: Install dependencies
+        working-directory: site
+        run: npm ci
+
+      - name: Build data
+        working-directory: site
+        run: npm run build:data
+
+      - name: Build site
+        working-directory: site
+        run: npm run build
+
+      - name: Setup Pages
+        uses: actions/configure-pages@983d7736d9b0ae728b81ab479565c72886d7745b # v5.0.0
+
+      - name: Upload artifact
+        uses: actions/upload-pages-artifact@56afc609e74202658d3ffba0e8f6dda462b719fa # v3.0.1
+        with:
+          path: site/dist
+
+  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@d6db90164ac5ed86f2b6aed7e0febac2b3c603fc # v4.0.5