fix social icons in footer

Author: jputrino

layouts/partials/footer.html

@@ -68,14 +68,14 @@
           <div class="col-md-2 d-none d-md-block">
             <span class="footer-head">Social</span>
                 <ul class="footer-social">
-                  <li><a href="https://www.facebook.com/nginxinc" title="facebook" aria-label="facebook" target="_blank" rel="noreferrer"><i class="fa fa-facebook-square fa-lg" aria-hidden="true"></i>
+                  <li><a href="https://www.facebook.com/nginxinc" title="facebook" aria-label="facebook" target="_blank" rel="noreferrer"><i class="fa-brands fa-facebook" aria-hidden="true"></i>
                     Facebook</a></li>
-                  <li><a href="https://twitter.com/nginx" title="twitter" aria-label="twitter" target="_blank" rel="noreferrer"><i class="fa fa-twitter fa-lg" aria-hidden="true"></i>Twitter</a></li>
-                  <li><a href="https://www.linkedin.com/company/nginx" title="linkedin" aria-label="linkedin" target="_blank" rel="noreferrer"><i class="fa fa-linkedin-square fa-lg" aria-hidden="true"></i>
+                  <li><a href="https://twitter.com/nginx" title="twitter" aria-label="twitter" target="_blank" rel="noreferrer"><i class="fa-brands fa-twitter" aria-hidden="true"></i>Twitter</a></li>
+                  <li><a href="https://www.linkedin.com/company/nginx" title="linkedin" aria-label="linkedin" target="_blank" rel="noreferrer"><i class="fa-brands fa-linkedin" aria-hidden="true"></i>
                     LinkedIn</a></li>
-                  <li><a href="https://www.youtube.com/user/NginxInc" title="youtube" aria-label="youtube" target="_blank" rel="noreferrer" alt="NGINX Youtube Channel"><i class="fa fa-youtube-square fa-lg" aria-hidden="true"></i>
+                  <li><a href="https://www.youtube.com/user/NginxInc" title="youtube" aria-label="youtube" target="_blank" rel="noreferrer" alt="NGINX Youtube Channel"><i class="fa-brands fa-square-youtube" aria-hidden="true"></i>
                     YouTube</a></li>
-                  <li><a href="https://www.nginx.com/feed/" title="rss" aria-label="rss" target="_blank" ><i class="fa fa-rss-square fa-lg" aria-hidden="true"></i>
+                  <li><a href="https://www.nginx.com/feed/" title="rss" aria-label="rss" target="_blank" ><i class="fa fa-rss-square" aria-hidden="true"></i>
                     RSS</a></li>
                 </ul>
           </div>