Remaining to do after the jQuery removal

• Update plugin pages
  • Carousel - still has a few references to $() (#28768)
  • Collapse - still has a few references to $() (#28768)
  • Dropdown (#28768)
  • List group
  • Modal (#28768)
  • Navs (#29181)
  • Popover (#28768)
  • ScrollSpy (#29181)
  • Toasts (#28779)
  • Tooltip (#28779)
• Other doc pages
  • getting-started/browsers-devices.md (#28779)
  • getting-started/javascript.md (#28768)
• Various
  • Add a section explaining that it's possible to use this version with and without jQuery
  • Search docs for jquery (not case sensitive) and $(
  • Replace https://codepen.io/Johann-S/pen/djJYPb or add a codepen with vanilla JS (#32163)
  • Maybe explain when an element is considered visible in the scrollspy callout
  • See if we really need DOMContentLoaded anymore in tests and docs. #28337
  • Remove If you’re building our JavaScript from source, it requires util.js. not needed anymore (#28779)
  • Remove https://twbs-bootstrap.netlify.com/docs/4.3/getting-started/browsers-devices/#android-stock-browser after #28317 or in that branch (#28779)