feat: overview revamp (#4432)

Author: danil-pavlov

docs/images/multiplatform/diagrams/kotlin-multiplatform-hierarchical-structure.svg

@@ -13,7 +13,7 @@
 		<toc-element hidden="true" topic="kotlin-tour-null-safety.md"/>
 	</toc-element>
 	<toc-element toc-title="Kotlin overview">
-		<toc-element topic="multiplatform.md"/>
+		<toc-element topic="multiplatform.topic"/>
 		<toc-element accepts-web-file-names="httpservlets.html" topic="server-overview.md"/>
 		<toc-element topic="android-overview.md"/>
 		<toc-element topic="wasm-overview.md"/>
@@ -118,7 +118,7 @@
 		<toc-element topic="reflection.md"/>
 	</toc-element>
 	<toc-element toc-title="Multiplatform development">
-		<toc-element accepts-web-file-names="building-mpp-with-gradle.html,intro-to-kotlin-mpp.html,mpp-intro.html,mpp-get-started.html,multiplatform-tutorials.html" toc-title="Introduction" topic="multiplatform-get-started.md"/>
+		<toc-element accepts-web-file-names="building-mpp-with-gradle.html,intro-to-kotlin-mpp.html,mpp-intro.html,mpp-get-started.html,multiplatform-tutorials.html,multiplatform-get-started.html" toc-title="Introduction" topic="multiplatform-intro.md"/>
 		<toc-element accepts-web-file-names="mpp-discover-project.html" toc-title="Understand basic project structure" topic="multiplatform-discover-project.md"/>
 		<toc-element toc-title="Explore advanced project structure" topic="multiplatform-advanced-project-structure.md"/>
 		<toc-element toc-title="Set up targets" accepts-web-file-names="mpp-set-up-targets.html" topic="multiplatform-set-up-targets.md"/>

docs/images/multiplatform/diagrams/multiplatform-compose.svg

@@ -93,7 +93,7 @@ Here you'll learn how to develop and improve your cross-platform application usi
    {style="tip"}
 
 4. **Learn more about Kotlin Multiplatform:**
-   * Learn more about [Kotlin Multiplatform](multiplatform-get-started.md).
+   * Learn more about [Kotlin Multiplatform](multiplatform-intro.md).
    * Look through [samples projects](https://www.jetbrains.com/help/kotlin-multiplatform-dev/multiplatform-samples.html).
    * [Publish a multiplatform library](multiplatform-publish-lib.md).
    * Learn how Kotlin Multiplatform is used at [Netflix](https://netflixtechblog.com/netflix-android-and-ios-studio-apps-kotlin-multiplatform-d6d4d8d25d23), [VMware](https://kotlinlang.org/lp/multiplatform/case-studies/vmware/), [Yandex](https://kotlinlang.org/lp/multiplatform/case-studies/yandex/), and [many other companies](https://kotlinlang.org/lp/multiplatform/case-studies/).

docs/kr.tree

@@ -597,7 +597,7 @@ tasks.jar(type: Jar) {
 
 ## Targeting multiple platforms
 
-Projects targeting [multiple platforms](multiplatform-dsl-reference.md#targets), called [multiplatform projects](multiplatform-get-started.md),
+Projects targeting [multiple platforms](multiplatform-dsl-reference.md#targets), called [multiplatform projects](multiplatform-intro.md),
 require the `kotlin-multiplatform` plugin.
 
 >The `kotlin-multiplatform` plugin works with Gradle %minGradleVersion% or later.
@@ -625,8 +625,8 @@ plugins {
 </tab>
 </tabs>
 
-Learn more about [Kotlin Multiplatform for different platforms](multiplatform-get-started.md) and 
-[Kotlin Multiplatform for iOS and Android](https://www.jetbrains.com/help/kotlin-multiplatform-dev/multiplatform-create-first-app.html).
+Learn more about [Kotlin Multiplatform for different platforms](multiplatform-intro.md) and 
+[Kotlin Multiplatform for iOS and Android](https://www.jetbrains.com/help/kotlin-multiplatform-dev/multiplatform-getting-started.html).
 
 ## Targeting Android
 

docs/topics/getting-started.md

@@ -21,7 +21,7 @@
         </primary>
         <secondary>
             <title>Kotlin Multiplatform</title>
-            <a href="https://www.jetbrains.com/kotlin-multiplatform/" summary="Learn how Kotlin Multiplatform helps you share code between your applications">Why Kotlin Multiplatform</a>
+            <a href="multiplatform.topic" summary="Explore the Kotlin Multiplatform technology to share code between your applications">Kotlin Multiplatform overview</a>
             <a href="https://kmp.jetbrains.com/" summary="Quickly create and download a multiplatform project template">Kotlin Multiplatform Wizard</a>
             <a href="https://www.jetbrains.com/help/kotlin-multiplatform-dev/multiplatform-create-first-app.html" summary="Create a mobile app that works on both Android and iOS">Get started with Kotlin Multiplatform</a>
             <a href="https://www.jetbrains.com/help/kotlin-multiplatform-dev/compose-multiplatform-create-first-app.html" summary="Use Compose Multiplatform to implement one user interface across mobile, desktop, and web">Get started with Compose Multiplatform</a>

docs/topics/gradle/gradle-configure-project.md

@@ -34,7 +34,7 @@ Here are a few examples of popular web frameworks for Kotlin/JS written by diffe
 _KVision_ is an object-oriented web framework that makes it possible to write applications in Kotlin/JS with ready-to-use components
 that can be used as building blocks for your application's user interface. You can use both reactive and imperative programming
 models to build your frontend, use connectors for Ktor, Spring Boot, and other frameworks to integrate it with your server-side
-applications, and share code using [Kotlin Multiplatform](multiplatform.md).
+applications, and share code using [Kotlin Multiplatform](multiplatform-intro.md).
 
 [Visit KVision site](https://kvision.io) for documentation, tutorials, and examples.
 

docs/topics/home.topic

@@ -90,14 +90,14 @@ The following tokens act as keywords in modifier lists of declarations, and they
 in other contexts:
 
  * `abstract` marks a class or member as [abstract](classes.md#abstract-classes).
- * `actual` denotes a platform-specific implementation in [multiplatform projects](multiplatform.md).
+ * `actual` denotes a platform-specific implementation in [multiplatform projects](multiplatform-expect-actual.md).
  * `annotation` declares an [annotation class](annotations.md).
  * `companion` declares a [companion object](object-declarations.md#companion-objects).
  * `const` marks a property as a [compile-time constant](properties.md#compile-time-constants).
  * `crossinline` forbids [non-local returns in a lambda passed to an inline function](inline-functions.md#non-local-returns).
  * `data` instructs the compiler to [generate canonical members for a class](data-classes.md).
  * `enum` declares an [enumeration](enum-classes.md).
- * `expect` marks a declaration as [platform-specific](multiplatform.md), expecting an implementation in platform modules.
+ * `expect` marks a declaration as [platform-specific](multiplatform-expect-actual.md), expecting an implementation in platform modules.
  * `external` marks a declaration as implemented outside of Kotlin (accessible through [JNI](java-interop.md#using-jni-with-kotlin) or in [JavaScript](js-interop.md#external-modifier)).
  * `final` forbids [overriding a member](inheritance.md#overriding-methods).
  * `infix` allows calling a function using [infix notation](functions.md#infix-notation).

docs/topics/js/js-overview.md

@@ -869,7 +869,7 @@ removed from the public API of the Kotlin Gradle plugin in future releases. This
 
 **What's the best practice now?**
 
-Use respective [Kotlin targets](https://kotlinlang.org/docs/multiplatform-dsl-reference.html#targets) instead, for example:
+Use respective [Kotlin targets](multiplatform-dsl-reference.md#targets) instead, for example:
 
 <table>
     <tr>

docs/topics/keyword-reference.md

@@ -1,8 +1,8 @@
 [//]: # (title: Multiplatform Gradle DSL reference)
 
-The Kotlin Multiplatform Gradle plugin is a tool for creating [Kotlin Multiplatform](multiplatform.md) projects.
+The Kotlin Multiplatform Gradle plugin is a tool for creating Kotlin Multiplatform projects.
 Here we provide a reference of its contents; use it as a reminder when writing Gradle build scripts
-for Kotlin Multiplatform projects. Learn the [concepts of Kotlin Multiplatform projects, how to create and configure them](multiplatform-get-started.md).
+for Kotlin Multiplatform projects. Learn the [concepts of Kotlin Multiplatform projects, how to create and configure them](multiplatform-intro.md).
 
 ## Id and version