Replace gitter with discord

README.md

@@ -15,7 +15,7 @@
   <a href="https://imgproxy.net/#pro">imgproxy Pro</a> |
   <a href="https://hub.docker.com/r/darthsim/imgproxy/">Docker</a> |
   <a href="https://twitter.com/imgproxy_net">Twitter</a> |
-  <a href="https://gitter.im/imgproxy/imgproxy">Chat</a>
+  <a href="https://discord.gg/5GgpXgtC9u">Discord</a>
 </h4>
 
 <p align="center">

docs/assets/docsify-init.js

@@ -6,9 +6,9 @@ if (window.DOCSIFY_ROUTER_MODE === "history") {
 
 var documentTitleBase = document.title;
 
-var gitterURL = "https://gitter.im/imgproxy/imgproxy";
-var gitterBadgeURL = "https://img.shields.io/gitter/room/imgproxy/imgproxy" +
-  "?color=1775d3&style=for-the-badge&logo=gitter";
+var gitterURL = "https://discord.gg/5GgpXgtC9u";
+var gitterBadgeURL = "https://img.shields.io/badge/chat-on%20Discord-blue"
+  + "?logo=discord&logoColor=white&style=for-the-badge";
 var gitterBadge = '<div class="gitter">' +
   '<a class="gitter-link" href="' + gitterURL + '" target="_blank">' +
   '<img alt="Chat on Gitter" src="' + gitterBadgeURL + '">' +