The version of ionicons in use, v2, dates from January 2015, and does not contain an icon for Mastodon. In recent versions, the library was re-architected to a component-based approach, so the effort to upgrade was at least similar to the effort of switching to Bootstrap Icons. Bootstrap Icons seems like a safer choice, given that the website already uses Bootstrap for layout.
In preparation for https://github.com/ietf-tools/wagtail_website/issues/253, I've replaced the icons from the Ionicons library with equivalent icons from Bootstrap Icons.
The version of ionicons in use, v2, dates from January 2015, and does not contain an icon for Mastodon. In recent versions, the library was re-architected to a component-based approach, so the effort to upgrade was at least similar to the effort of switching to Bootstrap Icons. Bootstrap Icons seems like a safer choice, given that the website already uses Bootstrap for layout.
Homepage with header
Homepage call to action
About page
News & blog
Meeting page
Mobile homepage