feat: update missing links on the home page

Author: Lancern

src/content/docs/index.mdx

@@ -23,7 +23,7 @@ import { LinkCard, CardGrid } from '@astrojs/starlight/components';
 
 <CardGrid>
   <LinkCard title="C++ Language Reference" href="/cpp/language/basic" />
-  <LinkCard title="C++ Library Reference" />
-  <LinkCard title="C Language Reference" />
+  <LinkCard title="C++ Library Reference" href="/cpp/library" />
+  <LinkCard title="C Language Reference" href="/c/language/basic" />
   <LinkCard title="C Library Reference" />
 </CardGrid>