Add heading and description on the changelog page

changelog.html

@@ -34,6 +34,20 @@
 	</div>
 
 	<div class="container">
+        <!-- Heading -->
+        <div class="row p-2">
+            <h1 class="text-center">AIUB Discobot Changelog</h1>
+        </div>
+
+        <!-- Description -->
+        <div class="row p-2">
+            <p>
+            This page contains the latest announcements and the bot development changelogs from the AIUB Discobot developer <strong>Mushfiqur Rahman Abir</strong>. This is the official changelog maintaining site for AIUB Discobot. The page will only contain updates and announcements about the discobot not about the website or any other things. The updates will be posted here as soon as they are released. The page will be updated regularly with the latest updates and announcements. So, keep an eye on this page to get the latest updates and announcements about the AIUB Discobot.
+            </p>
+
+        </div>
+
+
 		<div class="row text-center p-2">
 			<div class="col-md-6 mb-3">
 				<div class="card">