Gregory's Server
Mastodon admins running 4.3.0 can now customise their server's icons:
1. Log into your server's website with your admin account
2. Go to Administration > Server Settings > Branding
3. Upload the Favicon and/or App Icon you want to use
4. Click "Save Changes"
Favicon means the icon that appears when people bookmark your server on a web browser.
App Icon means the icon that appears if people install your server's website as a web app.