Restructure docs into manual/development and add implementation docs (#94)

## Summary by Sourcery

Restructure documentation into separate manual and development sections,
introduce detailed internal implementation docs for auth/Java/mod
loaders, and update site navigation, landing page links, and MDX tooling
(Mermaid, card styling) to match the new structure and tech stack.

Enhancements:
- Enable Mermaid rendering support in the docs app and add a reusable
Mermaid React component.
- Refine Docs page rendering by customizing Card styling and removing
redundant in-page titles/descriptions rendered by the layout.
- Align docs source configuration and routing comments with the new
manual-based default paths.

Documentation:
- Split user-facing docs under a new manual section and move contributor
content into a dedicated development section for both English and
Chinese.
- Add comprehensive internal implementation documentation covering
authentication, Java management, mod loader/version merging, event bus,
and architecture patterns in both English and Chinese.
- Update existing feature docs (mod loaders, Java, authentication) and
getting-started/troubleshooting pages to be more conceptual, pointing to
implementation docs for technical details.
- Refresh architecture docs to reflect the React/Zustand frontend stack
and add Mermaid-based architecture diagrams.
- Adjust navigation labels, home-page CTAs, and doc links to target the
new manual/development structure and routes.

---------

Co-authored-by: 简律纯 <i@jyunko.cn>

1 files changed, 0 insertions, 161 deletions

diff --git a/packages/docs/content/en/getting-started.mdx b/packages/docs/content/en/getting-started.mdx
deleted file mode 100644
index 5219f40..0000000
--- a/packages/docs/content/en/getting-started.mdx
+++ /dev/null
@@ -1,161 +0,0 @@
----
-title: Getting Started
-description: Quick start guide to using DropOut Minecraft Launcher
----
-
-# Getting Started
-
-DropOut is a modern, reproducible, and developer-grade Minecraft launcher built with Tauri v2 and Rust. This guide will help you get started with installing and using DropOut.
-
-## Installation
-
-### Download Pre-built Binaries
-
-Download the latest release for your platform from the [Releases](https://github.com/HsiangNianian/DropOut/releases) page.
-
-| Platform       | Files                   |
-| -------------- | ----------------------- |
-| Linux x86_64   | `.deb`, `.AppImage`     |
-| Linux ARM64    | `.deb`, `.AppImage`     |
-| macOS ARM64    | `.dmg`                  |
-| Windows x86_64 | `.msi`, `.exe`          |
-| Windows ARM64  | `.msi`, `.exe`          |
-
-### Linux Installation
-
-#### Using .deb Package
-```bash
-sudo dpkg -i dropout_*.deb
-# Fix dependencies if needed
-sudo apt-get install -f
-```
-
-#### Using AppImage
-```bash
-chmod +x dropout_*.AppImage
-./dropout_*.AppImage
-```
-
-### macOS Installation
-
-1. Open the downloaded `.dmg` file
-2. Drag DropOut to your Applications folder
-3. If you see a security warning, go to System Preferences → Security & Privacy and allow the app
-
-### Windows Installation
-
-#### Using .msi Installer
-1. Double-click the `.msi` file
-2. Follow the installation wizard
-3. Launch DropOut from the Start Menu
-
-#### Using .exe Portable
-1. Double-click the `.exe` file
-2. DropOut will run directly without installation
-
-## First Launch
-
-When you first launch DropOut, you'll need to:
-
-1. **Choose Authentication Method**
-   - **Microsoft Account**: Recommended for official Minecraft
-   - **Offline Mode**: For testing or offline play
-
-2. **Configure Java Runtime**
-   - DropOut will automatically detect installed Java versions
-   - You can download Java directly from the launcher if needed
-
-3. **Select Minecraft Version**
-   - Browse available Minecraft versions
-   - Choose vanilla or modded versions (Fabric/Forge)
-
-## Quick Start Tutorial
-
-### 1. Login
-
-<Cards>
-  <Card 
-    title="Microsoft Account" 
-    description="Login with your official Minecraft account"
-  />
-  <Card 
-    title="Offline Mode" 
-    description="Create a local profile for offline play"
-  />
-</Cards>
-
-**Microsoft Login:**
-1. Click "Login with Microsoft"
-2. A device code will be displayed
-3. Visit the URL shown and enter the code
-4. Authorize the application
-5. Return to DropOut - you'll be logged in automatically
-
-**Offline Login:**
-1. Click "Offline Mode"
-2. Enter a username
-3. Click "Create Account"
-
-### 2. Install Minecraft
-
-1. Navigate to the **Versions** tab
-2. Browse available Minecraft versions
-3. Click on a version to install it
-4. Wait for the download to complete
-
-### 3. Launch the Game
-
-1. Go to the **Home** tab
-2. Select your desired version from the dropdown
-3. Adjust settings if needed:
-   - Memory allocation (RAM)
-   - Window resolution
-   - Java path
-4. Click **"Launch Game"**
-5. Monitor the launch process in the console
-
-## Next Steps
-
-<Cards>
-  <Card 
-    title="Features" 
-    href="/docs/features"
-    description="Learn about all the features DropOut offers"
-  />
-  <Card 
-    title="Instances" 
-    href="/docs/features/instances"
-    description="Create isolated game environments"
-  />
-  <Card 
-    title="Mod Loaders" 
-    href="/docs/features/mod-loaders"
-    description="Install and manage Fabric and Forge"
-  />
-  <Card 
-    title="Troubleshooting" 
-    href="/docs/troubleshooting"
-    description="Common issues and solutions"
-  />
-</Cards>
-
-## System Requirements
-
-### Minimum Requirements
-- **OS**: Windows 10+, macOS 11+, or Linux (Debian-based)
-- **RAM**: 4GB (8GB recommended for modded Minecraft)
-- **Storage**: 2GB for launcher + game files
-- **Java**: Auto-installed by DropOut if not found
-
-### Recommended Requirements
-- **OS**: Latest stable version of your OS
-- **RAM**: 16GB for optimal performance with mods
-- **Storage**: 10GB+ for multiple versions and mods
-- **Java**: Java 17 or 21 (managed by DropOut)
-
-## Getting Help
-
-If you encounter issues:
-- Check the [Troubleshooting Guide](/docs/troubleshooting)
-- Report bugs on [GitHub Issues](https://github.com/HsiangNianian/DropOut/issues)
-- Join our community discussions