fix(ui): update social login design

* Update social login design 

- Responsive images
- Mobile layout as well

* changes according to hyperreality advices

modules/users/client/css/users.css

@@ -39,3 +39,14 @@
     width: 300px;
     height: 300px;
 }
+
+.social {
+   -webkit-transition-duration: 0.4s;
+   -moz-transition-duration: 0.4s;
+   -o-transition-duration: 0.4s;
+   transition-duration: 0.4s;
+}
+
+.social:hover {
+    opacity: 0.65;
+}