Update index.html

Author: ALDonzel

fr/index.html

@@ -46,7 +46,7 @@ <h1>
 
               <a href="https://github.com/datactivist" class="github pls"></a>
 
-              <a href="https://twitter.com/datactivi_st" class="twitter pls"></a>
+              <a href="https://www.linkedin.com/company/datactivist" class="linkedin pls"></a>
 
 
               <a href="/en" class="lang mls">En</a>