fix icon community and download same class

assets/css/contact.css

@@ -806,7 +806,7 @@
         }*/
 }
 
-.icon {
+.icon-com {
     width: 26%;
     height: 25%;
 }
\ No newline at end of file

html/contact.html

@@ -92,7 +92,7 @@ function(err, data) {
 	  <div id="sidebar-content">
 	    <ul class="side-feed">
 
-              <img class="icon" src="/assets/img/community/BTS_Mantis.png">
+              <img class="icon-com" src="/assets/img/community/BTS_Mantis.png">
 	      <li class="icon_1">
 		<a href="https://bts.frama-c.com/my_view_page.php" target="_blank">
 		  <div class="slideCaption">
@@ -105,7 +105,7 @@ function(err, data) {
                 </a>
 	      </li>
 
-              <img class="icon" src="/assets/img/community/stack_overflow.png">
+              <img class="icon-com" src="/assets/img/community/stack_overflow.png">
 	      <li class="icon_2">
 		<a href="https://stackoverflow.com/tags/frama-c/" target="_blank">
 		  <div class="slideCaption">
@@ -118,7 +118,7 @@ function(err, data) {
                 </a>
 	      </li>
 
-              <img class="icon" src="/assets/img/community/mails.png">
+              <img class="icon-com" src="/assets/img/community/mails.png">
 	      <li class="icon_3">
 		<a href="https://lists.gforge.inria.fr/pipermail/frama-c-discuss/" target="_blank">
 		  <div class="slideCaption">
@@ -131,7 +131,7 @@ function(err, data) {
                 </a>
 	      </li>
 
-              <img class="icon" src="/assets/img/community/github.png">
+              <img class="icon-com" src="/assets/img/community/github.png">
 	      <li class="icon_4">
 		<a href="https://github.com/frama-c" target="_blank">
 		  <div class="slideCaption">
@@ -144,7 +144,7 @@ function(err, data) {
                 </a>
 	      </li>
 
-              <img class="icon" src="/assets/img/community/github.png">
+              <img class="icon-com" src="/assets/img/community/github.png">
 	      <li class="icon_5">
 		<a href="https://github.com/acsl-language" target="_blank">
 		  <div class="slideCaption">
@@ -157,7 +157,7 @@ function(err, data) {
                 </a>
 	      </li>
 
-              <img class="icon" src="/assets/img/community/twitter.png">
+              <img class="icon-com" src="/assets/img/community/twitter.png">
 	      <li class="icon_6">
 		<a href="https://twitter.com/frama_c" target="_blank">
 		  <div class="slideCaption">