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/modules/plugins.js

@@ -4,5 +4,4 @@ export { imgLazy } from './components/img-lazyload';
 export { imgPopup } from './components/img-popup';
 export { initLocaleDatetime } from './components/locale-datetime';
 export { initPageviews } from './components/pageviews';
-export { smoothScroll } from './components/smooth-scroll';
 export { toc } from './components/toc';