Update the "share this article" section at the bottom of article

[just1602]

Twitter has been removed from the section, but I feel like we should have a share to mastodon button and a copy link one.

• For the mastodon button : https://www.kylereddoch.me/2023/02/20/creating-mastodon-share-button.html
• For the copy link to clipboard, I think we should copy the short URL if one is defined, otherwise copy the long one.