Refactor SteamOS session management and launcher scripts

- Removed obsolete launch_desktop.sh and launch_session.sh scripts.
- Introduced new steam-launcher script to handle Steam launching and session tracking.
- Added steam-short-session-tracker for monitoring short Steam sessions and triggering repairs.
- Created steamos and steamos-session scripts for managing the SteamOS session.
- Implemented steamos-session-select for switching between Gamescope and Plasma sessions.
- Updated SDDM configuration for autologin and session management.
- Added new systemd services and targets for managing Gamescope and Steam sessions.
- Created desktop entries and icons for ALVR and SteamOS shortcuts.
- Enhanced logging and error handling across scripts.
- Cleaned up unused systemd slice and service files.
- Updated Ansible playbook to reflect new configurations and file structures.

ansible/files/game_station/shortcuts/alvr.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Name=ALVR
+Comment=Linux Virtual Reality
+Exec=/opt/alvr/bin/alvr_dashboard
+Icon=alvr.png
+Terminal=false
+Type=Application
+Categories=Game;

ansible/files/game_station/shortcuts/steamos.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Name=SteamOS
+Comment=Switch to SteamOS 
+Exec=/usr/local/bin/steamos-session-select
+Icon=steamos.png
+Terminal=false
+Type=Application
+Categories=Game;