feat: add GitHub-style markdown alert support

package.json

@@ -30,7 +30,7 @@
     "astro": "astro",
     "generate:og": "tsx scripts/generate-og-image.ts",
     "prettier": "prettier --write **/*.{ts,tsx,css,astro} --ignore-path .gitignore",
-    "deploy": "git push origin main:prod"
+    "push:prod": "git push origin main:prod"
   },
   "dependencies": {
     "@astrojs/check": "^0.9.8",
@@ -59,6 +59,7 @@
     "rehype-external-links": "^3.0.0",
     "rehype-pretty-code": "^0.14.3",
     "remark-emoji": "^5.0.2",
+    "remark-github-blockquote-alert": "^2.1.0",
     "remark-math": "^6.0.0",
     "remark-sectionize": "^2.1.0",
     "satori": "^0.16.2",