Update docs (21245)

Signed-off-by: Nester.zhou <ester.zhou@huawei.com>

en/application-dev/quick-start/Readme-EN.md

@@ -2,7 +2,7 @@
 
 - Getting Started
   - [Before You Start](start-overview.md)
-  - [Getting Started with ArkTS in Stage Model](start-with-ets-stage.md)
+  - [Building the First ArkTS Application in Stage Model](start-with-ets-stage.md)
 - Development Fundamentals
   - Application Package Fundamentals
     - [Application Package Overview](application-package-overview.md)
@@ -41,8 +41,8 @@
   - [Resource Categories and Access](resource-categories-and-access.md)
 - Learning ArkTS
   - [Getting Started with ArkTS](arkts-get-started.md)
-  - [Introduction to ArkTS](arkts/introduction-to-arkts.md)
-  - [TypeScript to ArkTS Migration Guide](arkts/typescript-to-arkts-migration-guide.md)
+  - [Introduction to ArkTS](introduction-to-arkts.md)
+  - [TypeScript to ArkTS Migration Guide](typescript-to-arkts-migration-guide.md)
   - UI paradigms
     - Basic Syntax
       - [Basic Syntax Overview](arkts-basic-syntax-overview.md)
@@ -55,6 +55,7 @@
       - [\@Styles Decorator: Definition of Resusable Styles](arkts-style.md)
       - [\@Extend Decorator: Extension of Built-in Components](arkts-extend.md)
       - [stateStyles Decorator: Polymorphic Style](arkts-statestyles.md)
+      - [\@AnimatableExtend Decorator: Definition of Animatable Attributes](arkts-animatable-extend.md)
     - State Management
       - [State Management Overview](arkts-state-management-overview.md)
       - Component State Management

en/application-dev/quick-start/start-overview.md

@@ -44,4 +44,4 @@ To help you better understand the preceding basic concepts and application devel
 
 2. Install DevEco Studio and configure the development environment. For details, see [Setting Up the Development Environment](https://developer.harmonyos.com/en/docs/documentation/doc-guides-V3/environment_config-0000001052902427-V3).
 
-When you are done, follow the instructions in [Getting Started with ArkTS in Stage Model](start-with-ets-stage.md).
+When you are done, you can set out to [build your first ArkTS application in the stage model](start-with-ets-stage.md).

en/application-dev/quick-start/start-with-ets-stage.md

-# Getting Started with ArkTS in Stage Model
+# Building the First ArkTS Application in Stage Model
 
 
 >  **NOTE**

en/release-notes/changelogs/OpenHarmony_4.0.8.1/changelogs-arkui.md

+# ArkUI Subsystem Changelog
+
+## cl.arkui.1 Change of Certain Predicates of uiAppearance from Public APIs to System APIs
+
+Changed the namespace **uiAppearance** and its internal **DarkMode** enum predicates from public APIs to system APIs.
+
+**Change Impact**
+
+None. The namespace **uiAppearance** and its internal **DarkMode** enum are used only by system APIs before and after the change.
+
+**Key API/Component Changes**
+
+The system API description is added to the following APIs:
+
+- declare namespace uiAppearance
+
+- enum DarkMode
+
+- ALWAYS_DARK = 0
+
+- ALWAYS_LIGHT = 1