Describe recommended transition process from classic Flatpak installation to this.

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First off, I just discovered this tool (the recent update to SteamOS seems to update Flatpak so now the ol' bwrap: creation of new user namespaces was not disabled as requested error is rearing its ugly head) and think this tool is fantastic and vastly improves the user experience for XIVLauncher on Steamdeck. Thank you for doing this.

My ask is if you could update README.md to include a section that addresses how to transition to this new installation method when one already has XIVLauncher installed in the old recommended way (i.e. installed as a Flatpak, probably via the DE's app manager like Plasma's Discover Center and referenced in Steam as a non-Steam piece of software). Should that old install be removed? Is it detected automagically for me? Should I remove the Steam reference? etc.