Template still uses `custom_quarto_yml` in settings.ini

[michaelaye]

This option has been removed from the process a while ago. Template should remove this option from settings.ini.

Currently, a newly set-up project using this template results in this side remark in the terminal, upon first use of nbdev_prepare:

NB: `_quarto.yml` is no longer auto-updated. Remove `custom_quarto_yml` from `settings.ini`