refactor: Remove custom font and emoji font workaround

lib/config/app_config.dart

@@ -65,9 +65,6 @@ abstract class AppConfig {
   static const String pushNotificationsGatewayUrl =
       'https://push.fluffychat.im/_matrix/push/v1/notify';
   static const String pushNotificationsPusherFormat = 'event_id_only';
-  static const String emojiFontName = 'Noto Emoji';
-  static const String emojiFontUrl =
-      'https://github.com/googlefonts/noto-emoji/';
   static const double borderRadius = 18.0;
   static const double columnWidth = 360.0;
   static final Uri homeserverList = Uri(

lib/config/themes.dart

@@ -17,27 +17,6 @@ abstract class FluffyThemes {
   static bool isThreeColumnMode(BuildContext context) =>
       MediaQuery.of(context).size.width > FluffyThemes.columnWidth * 3.5;
 
-  static const fallbackTextStyle = TextStyle(
-    fontFamily: 'Ubuntu',
-    fontFamilyFallback: ['NotoEmoji'],
-  );
-
-  static var fallbackTextTheme = const TextTheme(
-    bodyLarge: fallbackTextStyle,
-    bodyMedium: fallbackTextStyle,
-    labelLarge: fallbackTextStyle,
-    bodySmall: fallbackTextStyle,
-    labelSmall: fallbackTextStyle,
-    displayLarge: fallbackTextStyle,
-    displayMedium: fallbackTextStyle,
-    displaySmall: fallbackTextStyle,
-    headlineMedium: fallbackTextStyle,
-    headlineSmall: fallbackTextStyle,
-    titleLarge: fallbackTextStyle,
-    titleMedium: fallbackTextStyle,
-    titleSmall: fallbackTextStyle,
-  );
-
   static LinearGradient backgroundGradient(
     BuildContext context,
     int alpha,
@@ -72,7 +51,6 @@ abstract class FluffyThemes {
       useMaterial3: true,
       brightness: brightness,
       colorScheme: colorScheme,
-      textTheme: fallbackTextTheme,
       dividerColor: brightness == Brightness.dark
           ? colorScheme.surfaceContainerHighest
           : colorScheme.surfaceContainer,

lib/utils/platform_infos.dart

@@ -54,11 +54,6 @@ abstract class PlatformInfos {
           icon: const Icon(Icons.source_outlined),
           label: Text(L10n.of(context).sourceCode),
         ),
-        TextButton.icon(
-          onPressed: () => launchUrlString(AppConfig.emojiFontUrl),
-          icon: const Icon(Icons.emoji_emotions_outlined),
-          label: const Text(AppConfig.emojiFontName),
-        ),
         Builder(
           builder: (innerContext) {
             return TextButton.icon(