feat: update certificate design with SVG template and Poppins font

- Changed certificate background from PNG to SVG for better quality
- Added Poppins font import to index.html
- Updated certificate layout with Team Name and Person Name in blue (#59bef5)
- Repositioned QR code to fit in designated white box placeholder
- Removed generated copyright and date overlays (now part of SVG template)
- Adjusted text positioning for better alignment with new design
- Increased canvas scale to 4x and wait time to 1500ms for sharper rendering

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

apps/hackathon/index.html

@@ -18,6 +18,9 @@
       type="image/svg+xml"
       href="/images/imphnen-logo-simple.svg"
     />
+    <link rel="preconnect" href="https://fonts.googleapis.com" />
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
+    <link href="https://fonts.googleapis.com/css2?family=Poppins:wght@400;600;700&display=swap" rel="stylesheet" />
     <link rel="stylesheet" href="/src/index.css" />
     <meta property="og:type" content="website" />
     <meta property="og:url" content="https://hackathon.imphnen.dev/" />