Configuration files under .config/cura and .local/share/cura are kept in
Git repositories. When Cura is launched, all untracked files are deleted and
changes are discarded. The desktop icon runs the run-cura which runs
config-reset before launching Cura.
To make persisent configuration changes, you need to commit these changes
before running Cura again. Run the config-commit script to do this. Changes
can be inspected using the config-status and config-diff scripts, but be
wary that Cura will jumble the configuration files. It seems that the options
are written in random order each time.
To upgrade Cura, put the new AppImage in this folder and change the symbolic
link cura to point to it.