suggestion - themes: add to config, create dir

[AtomicRobotMan0101]

Just updated to 18.4.0 ... nice!

I note with the new themes, its up to the users to add the needed bits to the config file.

Perhaps part of the upgrade /update script we could add these lines to the end to the end of the config?

[theme]
# default is no theme (native shell colours)
name = ""
# name = "marine"
# name = "autumn"
# add new themes to ./config/atuin/themes/
# view instructions here https://docs.atuin.sh/guide/theming/

Perhaps also create the theme directory to give people the idea that this is a thing?

p.s. I do like the marine one! Nice!

I look forward to putting a few suggested themes together to share. It will make a good new-years project.

[philtweir]

Thanks! Keen for @ellie 's thoughts first on what would/wouldn't make sense to automate, but happy to action any needed changes.

Looking forward to seeing new themes and glad you found it interesting to experiment with :)