Handle conversion plugin for Kirby

I have created my first Kirby plugin.

It transforms handles like @username@server.xyz into proper links, such as <a href="https://server.xyz/@username" title="@username's profile on server.xyz." class="...">@username</a>.

I developed this plugin for personal use, but it may also be useful to others.

Here are the supported sites:

This is my first plugin, so I’m open to any advice.