[v3] add remark-smartypants (#2628)

* add `remark-smartypants`

* update changeset

Author: Dimitri POSTOLOV

.changeset/fuzzy-radios-exist.md

@@ -0,0 +1,5 @@
+---
+'nextra': minor
+---
+
+add `remark-smartypants`

packages/nextra/package.json

@@ -137,6 +137,7 @@
     "remark-gfm": "^4.0.0",
     "remark-math": "^6.0.0",
     "remark-reading-time": "^2.0.1",
+    "remark-smartypants": "^2.1.0",
     "shiki": "npm:shikiji@0.6.10",
     "slash": "^5.1.0",
     "title": "^3.5.3",

packages/nextra/src/server/compile.ts

@@ -12,6 +12,7 @@ import remarkFrontmatter from 'remark-frontmatter'
 import remarkGfm from 'remark-gfm'
 import remarkMath from 'remark-math'
 import remarkReadingTime from 'remark-reading-time'
+import remarkSmartypants from 'remark-smartypants'
 import type { Pluggable, Plugin } from 'unified'
 import type {
   FrontMatter,
@@ -251,7 +252,8 @@ export async function compileMdx(
             replace: '',
             excludeExternalLinks: true
           }
-        ] satisfies Pluggable
+        ] satisfies Pluggable,
+        remarkSmartypants
       ].filter(truthy),
       rehypePlugins: [
         ...(rehypePlugins || []),