Refactor TabIndex to use fixed dark mode and comment out hotel service in ServicesScreen

- Set color scheme in TabIndex to a fixed 'dark' value for consistent theming.
- Commented out the hotel service option in ServicesScreen for potential future redesign.

app/(tabs)/index.tsx

@@ -4,7 +4,6 @@ import { useSafeAreaInsets } from 'react-native-safe-area-context';
 
 import { getPrayerTimes, cities } from '../../utils/prayerTimeCalculator';
 import i18n from '../../i18n';
-import { useColorScheme } from 'react-native';
 import Colors from '../../constants/Colors';
 
 type Prayer = {
@@ -15,7 +14,7 @@ type Prayer = {
 type City = keyof typeof cities;
 
 export default function TabIndex() {
-  const colorScheme = useColorScheme();
+  const colorScheme = 'dark';
   const theme = Colors[colorScheme ?? 'light'];
   const [selectedCity, setSelectedCity] = useState<City>('Makkah');
   const [prayerTimes, setPrayerTimes] = useState<Prayer[]>([]);

app/(tabs)/services.tsx

@@ -24,12 +24,12 @@ export default function ServicesScreen() {
       icon: <FontAwesome5 name="dollar-sign" size={24} color="#D4AF37" />,
       onPress: () => setCurrencyModalVisible(true),
     },
-    {
-      title: i18n.t('Hotel'),
-      name: 'hotelCard',
-      icon: <FontAwesome5 name="hotel" size={24} color="#D4AF37" />,
-      onPress: () => setHotelModalVisible(true),
-    },
+    // {
+    //   title: i18n.t('Hotel'),
+    //   name: 'hotelCard',
+    //   icon: <FontAwesome5 name="hotel" size={24} color="#D4AF37" />,
+    //   onPress: () => setHotelModalVisible(true),
+    // },
     {
       title: i18n.t('Lost room key'),
       name: 'lostKey',