refactor(deps): upgrade bootstrap from v4.6 to v5.2

- update class name of the spacing, font style, cards and toasts
- update attribute names &  tooltip usage
- remove custom smooth scroll
- syntax colors

_javascript/post.js

@@ -4,7 +4,6 @@ import {
   imgPopup,
   initLocaleDatetime,
   initClipboard,
-  smoothScroll,
   initPageviews,
   toc
 } from './modules/plugins';
@@ -17,5 +16,4 @@ imgPopup();
 initLocaleDatetime();
 initClipboard();
 toc();
-smoothScroll(); // must be called after toc is created
 initPageviews();