feat(theme-classic): autoscroll TOC with active link (#6317)

* feat(theme-common): add smooth TOC scrolling to active link

* docs: change the link of repeated content category in lifecycle api

* Update lifecycle-apis.md

* fix page container scrolling

Co-authored-by: Joshua Chen <sidachen2003@gmail.com>

packages/docusaurus-theme-common/src/utils/useTOCHighlight.ts

@@ -144,6 +144,7 @@ function useTOCHighlight(config: TOCHighlightConfig | undefined): void {
         }
         link.classList.add(linkActiveClassName);
         lastActiveLinkRef.current = link;
+        link.scrollIntoView({block: 'nearest'});
       } else {
         link.classList.remove(linkActiveClassName);
       }