Revert "feat: support more markdown syntaxes"

This reverts commit c9ae7cf942.

package.json

@@ -34,7 +34,6 @@
     "@tiptap/vue-3": "2.0.0-beta.203",
     "@types/fs-extra": "^9.0.13",
     "@types/js-yaml": "^4.0.5",
-    "@types/markdown-it": "^12.2.3",
     "@types/prettier": "^2.7.1",
     "@types/sanitize-html": "^2.6.2",
     "@types/wicg-file-system-access": "^2020.9.5",
@@ -51,7 +50,6 @@
     "fs-extra": "^10.1.0",
     "js-yaml": "^4.1.0",
     "lru-cache": "^7.14.1",
-    "markdown-it": "^13.0.1",
     "masto": "^4.6.8",
     "nuxt": "^3.0.0",
     "parse5": "^7.1.2",