switch to steam flatpak for gaming server

infrastructure/graduated/manjaro/gaming_server.md

@@ -32,8 +32,8 @@ Host gamebox2
 ## Basic Apps
 
 ```bash
-pacman -S vim
+sudo pacman -S vim
-flatpak install io.missioncenter.MissionCenter
+sudo flatpak install io.missioncenter.MissionCenter
 ```
 
 ## Install Sunshine
@@ -62,34 +62,42 @@ systemctl --user disable --now sunshine
 sudo flatpak uninstall --system --delete-data dev.lizardbyte.app.Sunshine
 ```
 
-## Install Steam
+## Steam
 
-<https://wiki.archlinux.org/title/Official_repositories#multilib>
+Play games.
 
 ```bash
-pacman -S steam
+sudo flatpak install com.valvesoftware.Steam
 ```
 
-1. Settings -> Autostart -> Add New -> Steam (Runtime)
+## MangoHud
 
-### mangohud
+<https://github.com/flightlessmango/MangoHud?tab=readme-ov-file#flatpak>
 
-Start steam with mangohud
+Pretty Numbers for your Games.
 
 ```bash
-sudo pacman -S mangohud lib32-mangohud
+sudo flatpak install org.freedesktop.Platform.VulkanLayer.MangoHud
-cp /usr/share/applications/steam.desktop ~/.local/share/applications/steam.desktop
+flatpak override --user --env=MANGOHUD=1 com.valvesoftware.Steam
+
+# Allow flatpak apps to read Mangohud config
+flatpak override --user --filesystem=xdg-config/MangoHud:ro
 ```
 
-Edit ~/.local/share/applications/steam.desktop
+Edit `~/.config/MangoHud/MangoHud.conf`
 
 ```conf
-Exec=/usr/bin/mangohud /usr/bin/steam-native %U
+## pre defined presets
-```
+# -1 = default
+#  0 = no display
+#  1 = fps only
+#  2 = horizontal view
+#  3 = extended
+#  4 = high detailed information
+preset=2
 
-```bash
+## Enable most of the toggleable parameters (currently excludes `histogram`)
-mkdir ~/.config/MangoHud
+# full
-cp /usr/share/doc/mangohud/MangoHud.conf.example ~/.config/MangoHud/MangoHud.conf
 ```
 
 ## Snapshot