Codex/recover unique content and add new tutorial

.gitignore

@@ -34,3 +34,4 @@ yarn-error.log*
 # generated files
 /public/rss/
 headlines.json
+.vscode

package.json

@@ -24,7 +24,6 @@
     "@next/third-parties": "^14.1.0",
     "@stripe/react-stripe-js": "^2.4.0",
     "@stripe/stripe-js": "^2.3.0",
-    "@types/mdx": "^2.0.9",
     "@types/node": "^20.4.7",
     "@types/react": "^18.2.18",
     "@types/stripe": "^8.0.417",
@@ -42,6 +41,7 @@
     "js-tiktoken": "^1.0.10",
     "next": "^13.4.16",
     "next-auth": "^4.24.5",
+    "next-mdx-remote": "^4.4.1",
     "next-router-mock": "^0.9.3",
     "next-themes": "^0.2.1",
     "nodemailer": "^6.9.9",
@@ -50,11 +50,16 @@
     "postmark": "^4.0.2",
     "react": "18.2.0",
     "react-dom": "18.2.0",
+    "react-markdown": "^9.0.1",
     "react-stripe-js": "^1.1.5",
     "react-tweet": "^3.1.1",
     "rehype-autolink-headings": "^7.1.0",
+    "rehype-sanitize": "^6.0.0",
     "rehype-slug": "^6.0.0",
+    "rehype-stringify": "^10.0.0",
+    "remark": "^15.0.1",
     "remark-gfm": "^3.0.1",
+    "remark-html": "^16.0.1",
     "remark-toc": "^9.0.0",
     "sharp": "^0.32.6",
     "stripe": "^14.12.0",
@@ -63,6 +68,7 @@
   },
   "devDependencies": {
     "@tailwindcss/typography": "^0.5.10",
+    "@types/mdx": "^2.0.9",
     "eslint": "^8.45.0",
     "eslint-config-next": "^13.4.16",
     "prettier": "^3.0.1",