docs(readme): readme images and links update (#1604)

README.md

@@ -2,7 +2,13 @@
 [![Join the chat at https://gitter.im/ng2-admin/Lobby](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/ng2-admin/Lobby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 [![Dependency Status](https://david-dm.org/akveo/ngx-admin/status.svg)](https://david-dm.org/akveo/ng2-admin)
 # Admin template based on Angular 5+, Bootstrap 4 and <a href="https://github.com/akveo/nebular">Nebular</a>
-<a target="_blank" href="http://akveo.com/ngx-admin/"><img src="https://i.imgur.com/XoJtfvK.gif"/></a>
+<a target="_blank" href="http://akveo.com/ngx-admin/#/pages/dashboard?utm_source=github&utm_medium=ngx_admin_readme&utm_campaign=demo"><img src="https://i.imgur.com/XoJtfvK.gif"/></a>
+
+### Two themes available:
+
+| Cosmic Theme | Business Theme |
+|:------------:|:--------------:|
+|<a target="_blank" href="http://akveo.com/ngx-admin/#/pages/dashboard?theme=cosmic&utm_source=github&utm_medium=ngx_admin_readme&utm_campaign=themes"><img src="https://i.imgur.com/FgRZcqL.png"/></a>|<a target="_blank" href="http://akveo.com/ngx-admin/#/pages/dashboard?theme=default&utm_source=github&utm_medium=ngx_admin_readme&utm_campaign=themes"><img src="https://i.imgur.com/fozHlRJ.png"/></a>|
 
 ### What's included: