Update docs for end users

- Remove architecture docs (for developers, not users)
- Update getting started with install instructions from README
- Focus on user-facing content only

Author: ammario

docs/src/SUMMARY.md

@@ -2,4 +2,3 @@
 
 - [Introduction](./intro.md)
 - [Getting Started](./getting-started.md)
-- [Architecture](./architecture.md)

docs/src/getting-started.md

@@ -1,45 +1,47 @@
 # Getting Started
 
-## Installation
+## Downloads
 
-### Prerequisites
+### Development Builds
 
-- [Bun](https://bun.sh) - JavaScript runtime and package manager
-- Git
+Pre-built binaries are available from [GitHub Actions](https://github.com/coder/cmux/actions/workflows/build.yml):
 
-### Clone and Install
+- **macOS**: Universal binary DMG (Intel + Apple Silicon)
+- **Linux**: AppImage (portable, works on most distros)
 
-```bash
-git clone https://github.com/ammarbandukwala/cmux.git
-cd cmux
-bun install
-```
+To download:
 
-## Development
+1. Go to the [Build workflow](https://github.com/coder/cmux/actions/workflows/build.yml)
+2. Click on the latest successful run
+3. Scroll down to "Artifacts" section
+4. Download `macos-dmg` or `linux-appimage`
 
-```bash
-# Start development server
-bun dev
+### Installation
 
-# In another terminal, start Electron
-bun start
-```
+**macOS:**
 
-## Building
+⚠️ **Note**: The app is unsigned, so you'll need to bypass Gatekeeper security.
 
-```bash
-# Build the application
-bun run build
+1. Download and open the DMG file
+2. Drag Cmux to Applications folder
+3. **First time opening**:
+   - Don't double-click the app (macOS will block it)
+   - Right-click (or Control+click) on Cmux.app
+   - Select "Open" from the menu
+   - Click "Open" in the security dialog
+   - The app will now be allowed to run
 
-# Package for distribution
-bun run dist:mac  # macOS
-bun run dist:linux  # Linux
-```
+**Alternative method if the above doesn't work:**
 
-## Configuration
+1. After step 2, open Terminal
+2. Run: `xattr -cr /Applications/Cmux.app`
+3. Run: `codesign --force --deep --sign - /Applications/Cmux.app`
+4. Now you can open the app normally
 
-Configuration is stored in `~/.cmux/config.json` and includes:
+These steps are only needed once. After that, you can open the app normally.
 
-- Active projects
-- Workspace settings
-- UI preferences
+**Linux:**
+
+1. Download the AppImage file
+2. Make it executable: `chmod +x Cmux-*.AppImage`
+3. Run it: `./Cmux-*.AppImage`