fix: correct twitter link on contact page (#590)

This fix will enable users to have the correct twitter link
and easily connect on Twitter
This will resolve issue #585

systers_portal/templates/common/contact.html

@@ -13,7 +13,7 @@ <h1 class="contact-head">Contact Systers</h1>
     </p>
     <div class="contact-social">
       <a href="https://www.facebook.com/AnitaB.0rg/" target="_blank"><i class="fa fa-facebook-official fa-2x contact-icon facebook_icon"></i></a>
-      <a href="https://twitter.com/systers_org" target="_blank"><i class="fa fa-twitter fa-2x contact-icon twitter_icon "></i></a>
+      <a href="https://twitter.com/anitab_org" target="_blank"><i class="fa fa-twitter fa-2x contact-icon twitter_icon "></i></a>
       <a href="https://www.linkedin.com/company/anitab-org" target="_blank"><i class="fa fa-linkedin fa-2x contact-icon linkedin_icon "></i></a>
       <a href="https://github.com/anitab-org" target="_blank"><i class="fa fa-github fa-2x contact-icon github_icon"></i></a>
     </div>