Added standalone installer for Raspberry Pi's running desktop or lite OS
Run the following from the command line to install
curl -kLO -H "Cache-Control: no-cache" https://raw.githubusercontent.com/MontesDesigns/pixelcade-linux-builds/refs/heads/main/install-scripts/setup-pixelcade.sh && sudo chmod +x setup-pixelcade.sh && ./setup-pixelcade.sh