fix: normalize markdown links to work on both GitHub and website

Adds path normalization to MarkdownLink component to handle the difference
between GitHub's file-based paths and the website's route-based paths.
Links like ./guides/foo.md now work correctly on both platforms.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: KyleAMathews

src/components/MarkdownLink.tsx

@@ -16,6 +16,14 @@ export function MarkdownLink({
 
   const [hrefWithoutHash, hash] = hrefProp?.split('#') ?? []
   let [to] = hrefWithoutHash?.split('.md') ?? []
+  
+  // Normalize relative paths that work in GitHub to work with our routing structure
+  // In GitHub: ./guides/foo.md works from docs/overview.md
+  // In our router: we need ../guides/foo because the current path is /lib/version/docs/overview (not overview/)
+  if (to?.startsWith('./')) {
+    // Convert ./path to ../path to account for the fact that we're at /docs/file not /docs/file/
+    to = '../' + to.slice(2)
+  }
 
   return (
     <Link