Link to Fluxer
If your community is on Fluxer, you can put one of these badges on your site. Download a badge and upload it to your site. Then copy its HTML, and replace the sample link with your community's invite link and the image path with where you put the badge. Use an invite link that never expires, because the invite dialog starts with a link that expires after 7 days.
HTML for the badge
<a href="https://fluxer.gg/your-invite"><img src="fluxer-badge-color.svg" alt="Join us on Fluxer" width="121" height="48"></a>For press questions, email press@fluxer.com.