Added subscribe to newsletter (#473)

* added subscribe to newsletter

* Added subscribe on linkedin

* Added subscribe on linkedin below about us

Author: Saipradyumnagoud

index.html

@@ -461,6 +461,7 @@ <h6>About Us</h6>
               Simplify your internship experience with our easy-to-follow
               articles and docs.
             </p>
+            <a class="libutton" href="https://www.linkedin.com/build-relation/newsletter-follow?entityUrn=7202959273855713280" target="_blank">Subscribe on LinkedIn</a>
           </div>
 
           <div class="col-xs-6 col-md-3">
@@ -500,30 +501,29 @@ <h6>Quick Links</h6>
         <hr />
       </div>
 
-<div class="col-xs-6 col-md-3">
-  <h6>Categories</h6>
-  <ul class="footer-links">
-    <li><a href="#">Web Design</a></li>
-    <li><a href="#">JavaScript</a></li>
-    <li><a href="#">HTML</a></li>
-    <li><a href="#">CSS</a></li>
-    <li><a href="#">Freebies</a></li>
-    <li><a href="#">Tutorials</a></li>
-  </ul>
-</div>
 
-<div class="col-xs-6 col-md-3">
-  <h6>Quick Links</h6>
-  <ul class="footer-links">
-    <li><a href="https://csedge.courses/about">About Us</a></li>
-    <li><a href="https://csedge.courses/#contact">Contact Us</a></li>
-    <li><a href="https://github.com/CSEdgeOfficial/learn.csedge.courses">Contribute</a></li>
-    <li><a href="./csedge.courses/privacypolicy.html">Privacy Policy</a></li>
-  </ul>
-</div>
-</div>
+      
+
+      
 
 </div>
+<style>
+  .libutton {
+    display: flex;
+    flex-direction: column;
+    justify-content: center;
+    padding: 7px;
+    text-align: center;
+    outline: none;
+    text-decoration: none !important;
+    color: #ffffff !important;
+    width: 200px;
+    height: 32px;
+    border-radius: 16px;
+    background-color: #0A66C2;
+    font-family: "SF Pro Text", Helvetica, sans-serif;
+  }
+</style>
 <hr style="border-top: 1px solid black;">
 
 <!-- Copyright Section -->