Fix Extera website link

Signed-off-by: Kim Brose <2803622+HarHarLinks@users.noreply.github.com>

Author: HarHarLinks

content/blog/2026/05/2026-05-04-twim.md

@@ -183,7 +183,7 @@ Continuwuity is a community-driven Matrix homeserver in Rust.
 
 ## Dept of Clients 📱
 
-### Extera Next ([website](https://conference.matrix.org/register/))
+### Extera Next ([website](https://extera.xyz))
 
 [rustyraven[extera.xyz op]](https://matrix.to/#/@rustyraven:extera.xyz) announces