Mobile app initial implementation.

Closes #3 (closed)

lib/src/screens/home.dart

@@ -20,7 +20,6 @@ class Home extends StatefulWidget {
 const hosts = [
   'https://rosengeorgiev.dev.vereign.com',
   'https://borisdimitrov.dev.vereign.com',
-  'https://app.vereign.com',
   'https://integration.vereign.com',
   'https://staging.vereign.com',
   'https://demo1.vereign.com',
@@ -39,7 +38,7 @@ const hosts = [
 ];
 
 class _HomeState extends State<Home> {
-  String _host = Config.appFlavor == Flavor.DEVELOPMENT ? hosts[0] : APP_HOST;
+  String _host = Config.appFlavor == Flavor.DEVELOPMENT ? hosts[0] : Config.DEFAULT_APP_HOST;
 
   @override
   initState() {
@@ -104,15 +103,17 @@ class _HomeState extends State<Home> {
   }
 
   startOAuth() {
+    var params = Config.getOAuthParams(host: _host);
+
     FlutterAppAuthWrapper.startAuth(
       AuthConfig(
-        clientId: CLIENT_ID,
-        clientSecret: CLIENT_SECRET,
-        redirectUrl: REDIRECT_URL,
+        clientId: params["clientId"],
+        clientSecret: params["clientSecret"],
+        redirectUrl: params["redirectUrl"],
         state: "login",
         prompt: "consent",
         endpoint: AuthEndpoint(
-            auth: AUTH_ENDPOINT, token: TOKEN_ENDPOINT),
+            auth: params["authEndpoint"], token: params["tokenEndpoint"]),
         scopes: [
           "user_account_status",
           "user_territory",