chore: remove useless packages

package.json

@@ -98,7 +98,6 @@
     "fumadocs-ui": "^15.5.3",
     "input-otp": "^1.4.2",
     "lucide-react": "^0.483.0",
-    "mdast-util-toc": "^7.1.0",
     "motion": "^12.4.3",
     "next": "15.2.1",
     "next-intl": "^4.0.0",
@@ -116,12 +115,6 @@
     "react-tweet": "^3.2.2",
     "react-use-measure": "^2.1.7",
     "recharts": "^2.15.1",
-    "rehype-autolink-headings": "^7.1.0",
-    "rehype-pretty-code": "^0.14.0",
-    "rehype-slug": "^6.0.0",
-    "remark": "^15.0.1",
-    "remark-code-import": "^1.2.0",
-    "remark-gfm": "^4.0.1",
     "resend": "^4.4.1",
     "shiki": "^2.4.2",
     "sonner": "^2.0.0",