Electron Linux: missing auto-updater, installer and app icon

[Flo0806]

Problem

On Linux the Electron app has several shortcomings compared to Windows/macOS:

1. No auto-updater - Windows and macOS have update checks, Linux does not. Users must manually download and replace the app.
2. No installer/setup - The app must be manually made executable and placed. No .deb/.AppImage/.snap package that integrates with the system.
3. No app icon - The application window and taskbar show a generic/missing icon.

Expected

• Auto-update notification (at minimum) or full auto-update support
• Proper Linux package format (.AppImage or .deb) with desktop integration
• App icon embedded in the Linux build