update setup instructions

docs/ios-install-altstore.md

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+# Installing Dusk on iOS via AltStore
+
+## Prerequisites
+
+- Mac with Homebrew installed
+- iPhone connected via USB
+- Dusk IPA file (download the latest `Dusk-vX.X.X-ios-arm64.ipa` from the [releases page](https://github.com/TwilitRealm/dusk/releases))
+- Game disc - `GZ2E01` (Gamecube USA) or `GZ2PE01` (Gamecube PAL)
+
+## 1. Install AltServer
+
+```sh
+brew install altserver
+open -a AltServer
+```
+
+AltServer will appear in your menu bar.
+
+## 2. Enable Developer Mode (iOS 16+)
+
+- On your iPhone, go to **Settings > Privacy & Security > Developer Mode**
+- Toggle it on and restart when prompted
+
+## 3. Install AltStore on Your iPhone
+
+- Click AltServer in the menu bar
+- Click **Install AltStore > [Your iPhone]**
+- Enter your Apple ID credentials when prompted
+- On your iPhone, go to **Settings > General > VPN & Device Management**
+- Tap your Apple ID under "Developer App" and tap **Trust**
+
+## 4. Copy Files to Your iPhone
+
+Transfer the IPA and game disc to your iPhone so they're accessible in the Files app. A few ways to do this:
+
+- **AirDrop** - Right-click the files on your Mac and choose Share > AirDrop
+- **iCloud Drive** - Place files in iCloud Drive on your Mac and they'll sync to Files on your iPhone
+- **USB transfer** - Connect your iPhone and drag files via Finder's sidebar
+- **Cloud storage** - Upload to Google Drive, Dropbox, etc. and download on your iPhone
+
+## 5. Install via AltStore
+
+- Open **AltStore** on your iPhone
+- Go to the **My Apps** tab
+- Tap the **+** button (top left)
+- Open the **Files** app and select the `.ipa` file