IMPORTANT NOTE: some of the tasks in this issue may be impacted by:

• Twitter/X account inactive? Remove it from the UG's landing page #1769

Tasks

• Use the X logo - NPM dependencies: Update font-awesome package to include new twitter logo #1754
• Replace references to https://twitter.com by https://x.com, probably only after X stops redirecting to twitter.com:

  $ curl -sI https://x.com                                             
  HTTP/2 302 
  date: Fri, 08 Dec 2023 22:35:34 GMT
  location: https://twitter.com/
  ...

• Replace "Twitter" by "X" or "X, formerly Twitter" -- probably wait for the previous item to happen