docs: links to migration guide + update navbar ecosystem links

Author: yyx990803

src/.vuepress/config.js

@@ -239,6 +239,10 @@ module.exports = {
             text: 'Guide',
             link: '/guide/introduction'
           },
+          {
+            text: 'v3 Migration Guide',
+            link: '/guide/migration/introduction'
+          },
           {
             text: 'Style Guide',
             link: '/style-guide/'
@@ -284,7 +288,7 @@ module.exports = {
             text: 'Official Projects',
             items: [{
                 text: 'Vue Router',
-                link: 'https://router.vuejs.org/'
+                link: 'https://next.router.vuejs.org/'
               },
               {
                 text: 'Vuex',
@@ -296,7 +300,7 @@ module.exports = {
               },
               {
                 text: 'Vue Test Utils',
-                link: 'https://vue-test-utils.vuejs.org/'
+                link: 'https://vuejs.github.io/vue-test-utils-next-docs/guide/introduction.html'
               },
               {
                 text: 'Devtools',

src/guide/installation.md

@@ -2,16 +2,13 @@
 
 ## Release Notes
 
-Latest beta version: ![beta](https://img.shields.io/npm/v/vue/next.svg)
+Latest version: ![npm](https://img.shields.io/npm/v/vue/next.svg)
 
-
-Detailed release notes for each version are available on [GitHub](https://github.com/vuejs/vue-next/releases).
+Detailed release notes for each version are available on [GitHub](https://github.com/vuejs/vue-next/blob/master/CHANGELOG.md).
 
 ## Vue Devtools
 
-> Currently in Beta
-
-> Vue Devtools for Vue 3 requires at least `vue@^3.0.0-rc.1`
+> Currently in Beta - Vuex and Router integration is still WIP
 
 When using Vue, we recommend also installing the [Vue Devtools](https://github.com/vuejs/vue-devtools#vue-devtools) in your browser, allowing you to inspect and debug your Vue applications in a more user-friendly interface.
 

src/guide/introduction.md

@@ -1,5 +1,9 @@
 # Introduction
 
+::: tip NOTE
+Already know Vue 2 and just want to learn about what's new in Vue 3? Check out the [Migration Guide](/guide/migration/introduction.html)!
+:::
+
 ## What is Vue.js?
 
 Vue (pronounced /vjuː/, like **view**) is a **progressive framework** for building user interfaces. Unlike other monolithic frameworks, Vue is designed from the ground up to be incrementally adoptable. The core library is focused on the view layer only, and is easy to pick up and integrate with other libraries or existing projects. On the other hand, Vue is also perfectly capable of powering sophisticated Single-Page Applications when used in combination with [modern tooling](../guide/single-file-component.html) and [supporting libraries](https://github.com/vuejs/awesome-vue#components--libraries).

src/guide/migration/introduction.md

@@ -32,7 +32,7 @@ Start learning Vue 3 at [Vue Mastery](https://www.vuemastery.com/courses-path/vu
   # select vue 3 preset
   ```
 
-## New Features
+## Notable New Features
 
 Some of the new features to keep an eye on in Vue 3 include:
 
@@ -43,10 +43,11 @@ Some of the new features to keep an eye on in Vue 3 include:
 - [`createRenderer` API from `@vue/runtime-core`](https://github.com/vuejs/vue-next/tree/master/packages/runtime-core) to create custom renderers
 - [SFC Composition API Syntax Sugar (`<script setup>`)](https://github.com/vuejs/rfcs/blob/sfc-improvements/active-rfcs/0000-sfc-script-setup.md) <Badge text="experimental" type="warning" />
 - [SFC State-driven CSS Variables (`<style vars>`)](https://github.com/vuejs/rfcs/blob/sfc-improvements/active-rfcs/0000-sfc-style-variables.md) <Badge text="experimental" type="warning" />
+- [SFC `<style scoped>` can now include global rules or rules that target only slotted content](https://github.com/vuejs/rfcs/blob/master/active-rfcs/0023-scoped-styles-changes.md)
 
 ## Breaking Changes
 
-::: tip
+::: tip NOTE
 We are still working on a dedicated Migration Build of Vue 3 with Vue 2 compatible behavior and runtime warnings of incompatible usage. If you are planning to migrate a non-trivial Vue 2 app, we strongly recommend waiting for the Migration Build for a smoother experience.
 :::
 
@@ -74,7 +75,7 @@ The following consists a list of breaking changes from 2.x:
 ### Render Function
 
 - [Render function API changed](/guide/migration/render-function-api.html)
-- [`$scopedSlots` property is removed and need to be replaced with `$slots`](/guide/migration/slots-unification.html)
+- [`$scopedSlots` property is removed and all slots are exposed via `$slots` as functions](/guide/migration/slots-unification.html)
 
 ### Custom Elements