BLISS shell saves its configuration under the
located in the system user config files directory in a specific
ESRF folder (under Linux:
If it does not exists, this file is created at Bliss startup.
Some customization options exist, for all sessions ran by the user.
light-theme can be defined,
to specify which syntax highlighting scheme to use depending
on the terminal background color.
The acceptable values are the ones from default
See https://pygments.org/demo/ for a demo, with the list of available styles.