Remove OpenHub badge and explain CII badge

index.html

@@ -46,9 +46,6 @@ layout: home_orekit
     anybody can use it to build any application, free or not. There are no
     strings attached to user code.</p>
 
-    <p><a href="https://bestpractices.coreinfrastructure.org/projects/2726"><img src="https://bestpractices.coreinfrastructure.org/projects/2726/badge"></a></p>
-    <p><script type='text/javascript' src='https://www.openhub.net/p/orekit/widgets/project_factoids_stats?format=js'></script></p>
-
   </div>
 
   <div class="col-sm-12 col-md-6 col-lg-4 col-xl-4">
@@ -134,6 +131,10 @@ layout: home_orekit
     <p>Several major actors of space research and industry are now involved
     into this project.</p>
 
+    <p>This project follows the FOSS development best practices identified by
+      the Core Infrastructure Initiative:
+      <a href="https://bestpractices.coreinfrastructure.org/projects/2726"><img src="https://bestpractices.coreinfrastructure.org/projects/2726/badge"></a></p>
+
     <h2><span class="fa fa-institution"></span> Open governance</h2>
 
     <p>The Orekit project is driven according to an