Add flatpak for Kubuntu 24.04

Update, remove & block snap completely + install flatpak for Discover store

This will delete all of your snap apps

1. sudo apt update && sudo apt full-upgrade && sudo reboot

bash <(curl -fsSL https://gitlab.com/scripts94/kubuntu-get-rid-of-snap/-/raw/main/Kubuntu_get_rid_of_Snap.sh)

sudo apt install flatpak plasma-discover-backend-flatpak
flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo