feat: use eslint-plugin-mdx for md/mdx files

Author: JounQin

README.md

@@ -66,7 +66,7 @@ module.exports = antfu(
       'eslint:recommended',
       // Other extends...
     ],
-  })
+  }),
 
   // Other flat configs...
 )
@@ -189,7 +189,7 @@ export default antfu({
   ignores: [
     './fixtures',
     // ...globs
-  ]
+  ],
 })
 ```
 
@@ -235,8 +235,6 @@ import {
   jsonc,
   markdown,
   node,
-  sortPackageJson,
-  sortTsconfig,
   stylistic,
   typescript,
   unicorn,
@@ -311,7 +309,7 @@ export default antfu(
     rules: {
       'style/semi': ['error', 'never'],
     },
-  }
+  },
 )
 ```
 
@@ -331,7 +329,7 @@ export default antfu({
     },
     yaml: {},
     // ...
-  }
+  },
 })
 ```
 
@@ -372,8 +370,8 @@ export default antfu({
      * Supports Prettier and dprint
      * By default uses Prettier
      */
-    markdown: 'prettier'
-  }
+    markdown: 'prettier',
+  },
 })
 ```
 
@@ -435,7 +433,7 @@ It's recommended to opt-in on each file individually using [configuration commen
 
 ```js
 /* eslint perfectionist/sort-objects: "error" */
-const objectWantedToSort = {
+export const objectWantedToSort = {
   a: 2,
   b: 1,
   c: 3,

package.json

@@ -78,7 +78,7 @@
     "eslint-plugin-i": "^2.29.0",
     "eslint-plugin-jsdoc": "^46.9.0",
     "eslint-plugin-jsonc": "^2.10.0",
-    "eslint-plugin-markdown": "^3.0.1",
+    "eslint-plugin-mdx": "^2.2.0",
     "eslint-plugin-n": "^16.3.1",
     "eslint-plugin-no-only-tests": "^3.1.0",
     "eslint-plugin-perfectionist": "^2.5.0",