Update discord invite link

internal/index.njk

@@ -33,7 +33,7 @@ title: Freeside
                                 src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/gitlab.svg"/></a>
                 </li>
                 <li>
-                    <a class="icon-link" href="https://discord.gg/qaz8dap"><img height="64" width="64"
+                    <a class="icon-link" href="http://discord.freeside.co.uk/"><img height="64" width="64"
                                 src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/discord.svg"/></a>
                 </li>
                 <li>
@@ -89,4 +89,4 @@ title: Freeside
                 <a href="https://github.com/freesidehull/studentresources"> View List </a>
             </button>
     </div>
-</div>
+</div>