Muon 0.2.1

This is a quick hotfix to address issues caused by the 18 November SteamOS update. If you have been having issues with Decky crashing in a loop, please try removing Muon by deleting the old directory (/home/deck/homebrew/plugins/muon) and re-installing version 0.2.1

Changes

• Removed deprecated decky-frontend-lib dependency and rewrote sleep manager to use non-deprecated function for module location.
• Upgraded Decky node packages to latest versions.