fix: use relative hrefs in docs sidebar for SSG path compatibility

Root-relative hrefs (/app-development) break when SSG is served under
a path prefix like /apps/docs/. Relative hrefs (app-development) work
correctly regardless of mount point — both /apps/docs/ prefix and
subdomain root /.

Author: V V

apps/docs/server/state.ts

@@ -36,7 +36,7 @@ export function toViewModel(state: DocsState, path?: string) {
     slug: doc.slug,
     title: doc.meta.title || doc.slug,
     active: doc.slug === slug,
-    href: '/' + doc.slug,
+    href: doc.slug,
   }));
 
   return {