feat: add manual and changelog url.

api/lib/apis.dart

@@ -3,7 +3,10 @@ class Apis {
   static const apiHost = 'home.debuggerx.com';
   static const apiPort = 30000;
 
-  static const appNewVersionUrl = 'https://www.debuggerx.com';
+  static const appNewVersionUrl = 'https://www.debuggerx.com/2022/01/21/dgm-changelog?from=app';
+
+  static appManualUrl(bool isWeb) =>
+      'https://www.debuggerx.com/2022/01/21/dgm-manual?from=app_${isWeb ? 'web' : 'linux'}';
 
   static final system = SystemApis();
   static final auth = AuthApis();
@@ -35,11 +38,13 @@ class SchemeApis {
 
   String user({required StringParam type}) => [path, 'user', type].joinPath();
 
-  String market({required StringParam type, required IntParam page, required IntParam pageSize}) => [path, 'market', type, page, pageSize].joinPath();
+  String market({required StringParam type, required IntParam page, required IntParam pageSize}) =>
+      [path, 'market', type, page, pageSize].joinPath();
 
   String download({required StringParam schemeId}) => [path, 'download', schemeId].joinPath();
 
-  String like({required StringParam schemeId, required StringParam isLike}) => [path, 'like', schemeId, isLike].joinPath();
+  String like({required StringParam schemeId, required StringParam isLike}) =>
+      [path, 'like', schemeId, isLike].joinPath();
 
   String get userLikes => [path, 'user-likes'].joinPath();
 }

app/lib/widgets/help_button.dart

@@ -1,5 +1,8 @@
 import 'package:dde_gesture_manager/extensions.dart';
+import 'package:dde_gesture_manager_api/apis.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
+import 'package:url_launcher/url_launcher.dart';
 
 class HelpButton extends StatelessWidget {
   const HelpButton({Key? key}) : super(key: key);
@@ -7,7 +10,11 @@ class HelpButton extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return GestureDetector(
-      onTap: () {},
+      onTap: () async {
+        if (await canLaunch(Apis.appManualUrl(kIsWeb))) {
+          await launch(Apis.appManualUrl(kIsWeb));
+        }
+      },
       child: MouseRegion(
         cursor: SystemMouseCursors.click,
         child: Tooltip(