fix button and add mumble URL

index.html

@@ -2,7 +2,7 @@
 layout: page
 title: "NixNet"
 subtitle: "Your one-man Libre Hosting provider"
-description: "NixNet is a network of websites and services hosted by Amolith available for anyone to use free of charge."
+description: "A network of websites and services hosted by Amolith available for anyone to use free of charge."
 cover: /cover.png
 sitemap:
 priority: 0.9
@@ -21,7 +21,7 @@ priority: 0.9
         <div class="card">
             <h1><b>Mumble</b></h1> 
             <p>Mumble is an open source, low-latency, high quality voice chat software primarily intended for use while gaming. It's also great for private calls between yourself and others.</p> 
-            <a href="https://sea.nixnet.xyz" target="_blank"><button class="button">Chat!</button></a>
+            <a href="mumble://nixnet.xyz" target="_blank"><button class="button">Chat!</button></a>
         </div>
         <div class="card">
             <h1><b>Gitea</b></h1>