docs: Update Arch Linux installation instructions

Removed 'wl-clipboard' and 'cliphist' from the installation command for Arch Linux. Because dms doesn't request that now.

Author: Xarth-Mai

docs/wiki/Getting-Started.md

@@ -12,7 +12,7 @@ systemctl --user add-wants niri.service dms
 Arch Linux (via [paru](https://github.com/morganamilo/paru)):
 ```
 sudo pacman -Syu niri xwayland-satellite xdg-desktop-portal-gnome xdg-desktop-portal-gtk alacritty
-paru -S dms-shell-bin matugen wl-clipboard cliphist cava qt6-multimedia-ffmpeg
+paru -S dms-shell-bin matugen cava qt6-multimedia-ffmpeg
 systemctl --user add-wants niri.service dms
 ```