updated hardcoded federated nexus usercount

Author: Henry-Hiles

src/pages/index.astro

@@ -77,7 +77,7 @@ import CallToAction from "../components/CallToAction.astro"
                             I run <a href="https://federated.nexus"
                                 >Federated Nexus</a
                             >, a community resource hosted on Nix with <span
-                                id="user-count">over 450</span
+                                id="user-count">over 500</span
                             > users. We host many FOSS (especially federated) services,
                             including Matrix, LaSuite Docs, and Forgejo.
                         </p>