fix(theme): prevent TypeError when navigating to page without outline (#5329)

Co-authored-by: Divyansh Singh <40380293+brc-dd@users.noreply.github.com>

src/client/theme-default/composables/outline.ts

@@ -100,7 +100,6 @@ export function useActiveAnchor(
 
   onUnmounted(() => {
     window.removeEventListener('scroll', onScroll)
-    container.value.removeEventListener('click', onClick)
   })
 
   function onClick(e: MouseEvent) {