email refacts trying to use creds

+ Admin user deletion from user list
+ Admin send email confirmation message from user list
+ WebSocket minor change

src/Yavsc/Views/Administration/Index.cshtml

@@ -46,4 +46,14 @@ Nombre  </dt><dd> @Model.AdminCount</dd>
 
 <a asp-controller="HairTaints" class="btn btn-primary">
     Gestion des couleurs
-</a>
+</a>
+
+<h3>GCM Devices</h3>
+<a asp-controller="GCMDevices" class="btn btn-primary">
+     Google Cloud Messaging
+</a>
+
+<h3>Applications tièrces</h3>
+<a asp-controller="Client" class="btn btn-primary">
+     @SR["OAuth key management"]
+</a>