fixing invalid discord link

The current one is expired/invalid

index.html

@@ -646,7 +646,7 @@
 							
 							<li>
 								<figure>
-									<a href="https://discord.gg/ENbgme4bWq">
+									<a href="https://discord.gg/zppSeYtp6H">
 										<i class="ico-discord">
 											<svg>
 												<use xlink:href="#ico-discord"></use>
@@ -656,7 +656,7 @@
 								</figure>
 
 								<h4>
-									<a href="https://discord.gg/ENbgme4bWq">Discord</a>
+									<a href="https://discord.gg/zppSeYtp6H">Discord</a>
 								</h4>
 							</li>