Update conference kit banners (#2389)

This PR adds a `/conf/conference-kit` page we can use to iterate and
download the roll-up banners, and maybe in the future stickers and other
things.

I realized having this in the repo makes the most sense, because
importing / copying existing text, design and icons is way faster and
easier than trying to get something consistent and usable from an AI
agent :)

I pulled in `qrcode` library to generate QR codes here.

<img width="970" height="747" alt="image"
src="https://github.com/user-attachments/assets/b3e8c88a-ce60-430c-8855-5bbdb7ee1403"
/>

Take note that we must run the `pnpm conference-kit` to make the zip
archive, it doesn't get updated in normal website build.

Author: hasparus

package.json

@@ -8,6 +8,7 @@
     "analyze": "ANALYZE=true next build",
     "build": "next build",
     "check:links": "lychee --verbose --no-progress './src/pages/**/*.mdx' --base https://graphql.org",
+    "conference-kit": "tsx scripts/render-conference-kit-banners.ts",
     "dev": "next",
     "format": "pnpm format:check --write",
     "format:check": "prettier --cache --check .",
@@ -74,6 +75,7 @@
     "playwright-core": "^1.54.2",
     "postcss": "^8.4.49",
     "postcss-import": "^16.1.1",
+    "qrcode": "^1.5.4",
     "react": "^18.3.1",
     "react-dom": "^18.3.1",
     "react-medium-image-zoom": "5.2.13",
@@ -104,6 +106,7 @@
     "@types/hast": "3.0.4",
     "@types/jsdom": "^21.1.7",
     "@types/node": "^22.10.5",
+    "@types/qrcode": "^1.5.6",
     "@types/react": "^18.3.23",
     "@types/rss": "0.0.32",
     "@types/string-similarity": "^4.0.2",