Changed join link

because old link directed to social-media

Author: MoonTM-GIT

JavaDiscord/rules.html

@@ -31,7 +31,7 @@
                 <li><a href="./index.html">Home</a></li>
                 <li><a href="./rules.html" class="active-link">Rules<hr></a></li>
             </ul>
-            <a href="https://discord.gg/x65hqE6" class="nav-ul join-btn" id="nav-ul">Join</a>
+            <a href="https://discord.gg/X3NmMgzFKF" class="nav-ul join-btn" id="nav-ul">Join</a>
         </nav>
     </div>
     <!-- Content -->