Added vitepress for documentation. (#6270)

doc/index.md

@@ -0,0 +1,39 @@
+---
+# https://vitepress.dev/reference/default-theme-home-page
+layout: home
+
+hero:
+  name: "Etherpad"
+  text: "Next generation collaborative document editing"
+  tagline: Make your documents come alive
+  image:
+    src: /favicon.ico
+    alt: Etherpad hero image
+  actions:
+    - theme: brand
+      text: Install
+      link: /docker
+    - theme: alt
+      text: API documentation
+      link: /api/
+features:
+  - icon: ⚡️
+    title: Real-time editing
+    details: Collaborate with others in real-time. See changes as they happen in an instant
+  - icon: 🛠️
+    title: Extensible plugin framework
+    details: Add new features to Etherpad with plugins. Create your own or use existing ones
+  - icon: 💬
+    title: Real-time chat
+    details: Communicate with others while editing. Discuss changes and share ideas
+  - icon: 📝
+    title: Rich text editing
+    details: Format text, add images, and more. Create beautiful documents with ease
+  - icon: 🌐
+    title: Multi-language support
+    details: Use Etherpad in your preferred language. Localize the interface and documents
+  - icon: 📦
+    title: Easy to install
+    details: Get started quickly with Docker. Install Etherpad with a single command
+---
+