Mobile app initial implementation.

Closes #3 (closed)

lib/src/screens/home.dart

@@ -18,28 +18,8 @@ class Home extends StatefulWidget {
   _HomeState createState() => _HomeState();
 }
 
-const hosts = [
-  'https://demo1.vereign.com',
-  'https://demo2.vereign.com',
-  'https://rosengeorgiev.dev.vereign.com',
-  'https://borisdimitrov.dev.vereign.com',
-  'https://integration.vereign.com',
-  'https://staging.vereign.com',
-  'https://damyanmitev.dev.vereign.com',
-  'https://gospodinbodurov.dev.vereign.com',
-  'https://alexeylunin.dev.vereign.com',
-  'https://igormarkin.dev.vereign.com',
-  'https://mikhaildorokhovich.dev.vereign.com',
-  'https://sashailieva.dev.vereign.com',
-  'https://alexanderholodov.dev.vereign.com',
-  'https://olguncengiz.dev.vereign.com',
-  'https://viktorpopov.dev.vereign.com',
-  'https://kalincanov.dev.vereign.com',
-  'https://alexeykuklin.dev.vereign.com'
-];
-
 class _HomeState extends State<Home> {
-  String _host = Config.appFlavor == Flavor.DEVELOPMENT ? hosts[0] : Config.DEFAULT_APP_HOST;
+  String _host = Config.appFlavor == Flavor.DEVELOPMENT ? Config.HOSTS[0] : Config.DEFAULT_APP_HOST;
 
   @override
   initState() {
@@ -153,7 +133,7 @@ class _HomeState extends State<Home> {
                 _host = newValue;
               });
             },
-            items: hosts
+            items: Config.HOSTS
                 .map<DropdownMenuItem<String>>((String value) {
                   return DropdownMenuItem<String>(
                     value: value,