Add a “toot” link to share on mastodon and the fediverse

It’d be great if along side the twitter share link, we also had a toot link to share to mastodon or other activity pub service, not sure if there’s an easy bit of js we can drop in or how to do it, any ideas?

The issue does not name any files or tests. Start by locating the existing Twitter share link and its JavaScript entry point, then determine the supported Mastodon or ActivityPub sharing URL behavior. Done means a working “toot” link appears alongside Twitter and shares the current content correctly.

Written by the indexing model from the issue text.