remove tweeter, fix broken topnav icons

_includes/head.html

@@ -19,7 +19,10 @@
 
     <link rel="canonical" href="{{ page.url | replace:'index.html','' | relative_url }}">
     <link rel="alternate" type="application/rss+xml" title="{{ site.title }}" href="{{ "/feed.xml" | relative_url }}" />
-
+
+    <!-- Load Font Awesome 5 or 6 -->
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.0/css/all.min.css" integrity="..." crossorigin="anonymous">
+
     <!-- Place your kit's code here -->
     <script src="https://kit.fontawesome.com/f17953d81d.js" crossorigin="anonymous"></script>
 </head>

_includes/topnav.html

@@ -27,7 +27,6 @@
                 <ul class="nav navbar-nav">
                     <li><a href="https://www.youtube.com/channel/UCxv_00gWLAQPBUnl9mGRQjA"><i class="fab fa-youtube" aria-hidden="true"></i></a></li>
                     <li><a href="{{ site.git_address }}"><i class="fab fa-github" aria-hidden="true"></i></a></li>
-                    <li><a href="https://twitter.com/intent/user?screen_name=su2code"><i class="fab fa-twitter" aria-hidden="true"></i></a></li>
                     <li><a href="https://www.facebook.com/su2code/"><i class="fab fa-facebook" aria-hidden="true"></i></a></li>
                     <li><a href="https://www.linkedin.com/company/su2code/"><i class="fab fa-linkedin" aria-hidden="true"></i></a></li>
                 </ul>

index.html

@@ -12,7 +12,7 @@
       })
   })
 </script>
-</head> 
+</head>
 
 <div class="header-container jumbotron">
     <div class="container">   <!--- style="background-color:white" --->
@@ -46,24 +46,17 @@ <h3>Registration and abstract submission are open now and the links to the respe
       </div>
     </div>
     <!-- End Special Banner -->
-    
+
     <div class="row">
-        <div class="col-md-6">
-            <img src="img/logos/logoSU2.png" alt="" class="img-responsive">
-            <h2 class="header-light regular-pad">What is SU2?</h2>
-            <blockquote>
-              <p>Computational analysis tools have revolutionized the way we design engineering systems, but most established codes are proprietary, unavailable, or prohibitively expensive for many users. The SU2 team is changing this, making multiphysics analysis and design optimization software freely available and involving everyone in its creation and development.</p>
-
-              <p>Find a detailed description of the code philosophy, components, and implementations in the SU2 <a href="https://arc.aiaa.org/doi/abs/10.2514/1.J053813">AIAA Journal article</a>. Whether it's <a href="documents/AIAA-2016-3518.pdf">discrete adjoints</a>, <a href="documents/2017_J._Phys.3A_Conf._Ser._821_012013.pdf">non-ideal compressible CFD</a>, <a href="http://dx.doi.org/10.1016/j.compfluid.2016.02.003">high-performance computing</a>, or <a href="documents/AIAA-2018-3111.pdf"> incompressible flows with heat transfer</a>, SU2 has something for you.</p>
-            </blockquote>
-        </div>
-        <div class="col-md-6 text-center">
-          <div class='jekyll-twitter-plugin' align="center">
-              <div class='jekyll-twitter-plugin'><a class="twitter-timeline" data-width="500" data-tweet-limit="4" href="https://twitter.com/su2code?ref_src=twsrc%5Etfw">Tweets by su2code</a>
-            <script async src="https://platform.twitter.com/widgets.js" charset="utf-8"></script>
-            </div>
-          </div>
-        </div>
+      <center>
+      <img src="img/logos/logoSU2.png" alt="" class="img-responsive">
+      </center>
+      <h2 class="header-light regular-pad">What is SU2?</h2>
+      <blockquote>
+        <p>Computational analysis tools have revolutionized the way we design engineering systems, but most established codes are proprietary, unavailable, or prohibitively expensive for many users. The SU2 team is changing this, making multiphysics analysis and design optimization software freely available and involving everyone in its creation and development.</p>
+
+        <p>Find a detailed description of the code philosophy, components, and implementations in the SU2 <a href="https://arc.aiaa.org/doi/abs/10.2514/1.J053813">AIAA Journal article</a>. Whether it's <a href="documents/AIAA-2016-3518.pdf">discrete adjoints</a>, <a href="documents/2017_J._Phys.3A_Conf._Ser._821_012013.pdf">non-ideal compressible CFD</a>, <a href="http://dx.doi.org/10.1016/j.compfluid.2016.02.003">high-performance computing</a>, or <a href="documents/AIAA-2018-3111.pdf"> incompressible flows with heat transfer</a>, SU2 has something for you.</p>
+      </blockquote>
     </div>
 
     <hr>
@@ -105,10 +98,10 @@ <h1 class="text-center"><i class="fa fa-connectdevelop" aria-hidden="true"></i><
         <h3 class="text-center">A strong foundation.</h3>
 
         <p>The SU2 community continues to grow rapidly, and together, we are making a measurable, worldwide impact on CFD. Now, it's time to tap into our collective expertise, creativity, and skills to take the project to the next level.</p>
-         
+
          <p>We are proud to announce the <a href="https://su2foundation.org">SU2 Foundation</a>, a new non-profit organization formed in the United States. The mission of the SU2 Foundation is to promote global software development and education to increase the pace of innovation in the engineering sciences for the benefit of all society.</p>
 
-      </div> 
+      </div>
 
       <div class="col-md-6 text-center">
         <h1 class="text-center"><i class="fa fa-book" aria-hidden="true"></i></h1>