Update installation.rst with information about the Flatpak nightly repo
I hope I didn't miss anything important. Not sure if I should mention the new https://cdn.kde.org/flatpak/ since Krita doesn't seem to be there either.
Edited by Wen Yi Lim
I hope I didn't miss anything important. Not sure if I should mention the new https://cdn.kde.org/flatpak/ since Krita doesn't seem to be there either.