Fix 404 for README-based section pages in Express router

Resolve directory README.html paths for nav links like 周易 and 中医宝典.

Co-authored-by: Cursor <cursoragent@cursor.com>

index.md

@@ -11,7 +11,7 @@ hero:
       link: /道德经/01
     - theme: alt
       text: 五行
-      link: /金、木、水、火、土%20-%20五行/
+      link: /金、木、水、火、土 - 五行/
 
 features:
   - title: 道德经
@@ -30,7 +30,7 @@ features:
 
 ## 快速导航
 
-- [五行](/金、木、水、火、土%20-%20五行/)
+- [五行](/金、木、水、火、土 - 五行/)
 - [抱朴子](/抱朴子/)
 - [鬼谷子](/鬼谷子/捭阖)
 - [风水](/风水/REAME)