Delete unused components.

related to #48

navigation/MainTabNavigator.tsx

@@ -3,11 +3,8 @@ import { Platform } from 'react-native';
 import { createStackNavigator, createBottomTabNavigator } from 'react-navigation';
 
 import TabBarIcon from '../components/TabBarIcon';
-import HomeScreen from '../screens/HomeScreen';
 import MainScreen from '../screens/MainScreen';
 import AllScreen from '../screens/AllScreen';
-import LinksScreen from '../screens/LinksScreen';
-import SettingsScreen from '../screens/SettingsScreen';
 import MapScreen from '../screens/MapScreen';
 import UserScreen from '../screens/UserScreen';
 import NearbyScreen from '../screens/NearbyScreen';
@@ -20,29 +17,6 @@ const config = Platform.select({
   default: {},
 });
 
-const HomeStack = createStackNavigator(
-  {
-    Home: HomeScreen,
-  },
-  config
-);
-
-HomeStack.navigationOptions = {
-  tabBarLabel: 'Home',
-  tabBarIcon: ({ focused }) => (
-    <TabBarIcon
-      focused={focused}
-      name={
-        Platform.OS === 'ios'
-          ? `ios-information-circle${focused ? '' : '-outline'}`
-          : 'md-information-circle'
-      }
-    />
-  ),
-};
-
-HomeStack.path = '';
-
 const MainStack = createStackNavigator(
   {
     Main: { screen: MainScreen },
@@ -80,38 +54,6 @@ AllStack.navigationOptions = {
 
 AllStack.path = '';
 
-const LinksStack = createStackNavigator(
-  {
-    Links: LinksScreen,
-  },
-  config
-);
-
-LinksStack.navigationOptions = {
-  tabBarLabel: 'Links',
-  tabBarIcon: ({ focused }) => (
-    <TabBarIcon focused={focused} name={Platform.OS === 'ios' ? 'ios-link' : 'md-link'} />
-  ),
-};
-
-LinksStack.path = '';
-
-const SettingsStack = createStackNavigator(
-  {
-    Settings: SettingsScreen,
-  },
-  config
-);
-
-SettingsStack.navigationOptions = {
-  tabBarLabel: 'Settings',
-  tabBarIcon: ({ focused }) => (
-    <TabBarIcon focused={focused} name={Platform.OS === 'ios' ? 'ios-options' : 'md-options'} />
-  ),
-};
-
-SettingsStack.path = '';
-
 const NearbyStack = createStackNavigator(
   {
     Nearby: NearbyScreen,