feat: The Steamify shortcut opens the app

Steamify CachyOS on the desktop and in the launcher starts the newest app
(in Konsole the first time, while PySide6 still has to be installed); the
terminal menu is Steamify Terminal in the launcher. A shortcut from before
2.0.1 is ticked in the menu, so a normal run replaces it. steamify-app.sh
leaves the shortcut's launcher entry (same id) alone.

steamify.sh

@@ -15,7 +15,7 @@
 set -uo pipefail
 
 # Release version, see CHANGELOG.md.
-VERSION=2.0.0
+VERSION=2.0.1
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"