Feature request: Add custom themes on `.leptonrc`

[aravezskinteeth]

The more we know about your system and use case, the more easily and likely we can help.

Environment info

• OS: MacOS Monterrey 12
• App Version (Command/Ctrl + ,): v.1.10

Description of the problem / feature request / question:

I'd like to be able to customize the app theme beyond just a light or dark theme with a color scheme like catppuccin. And also being able to change the highlight colors with the same color scheme. For example, the user could make a yaml, toml or other type of file with html color configurations and link it to the .leptonrc. Maybe it's too much to ask, but it's just an idea.