Default predefined color presets

[Acclorite]

Why you want this feature to be implemented? Please describe.
By @MalcolmReed-ent
Sometimes, reading in light mode, especially on a phone, can be straining on the eyes. Adjusting the theme by selecting specific RGB or HSL colors can be a bit tedious. I was wondering if we could add presets for themes, such as sepia for preset 2 and dark mode for preset 3. This would make it easier for users to switch between comfortable reading options without having to manually adjust each color value in the color settings.

Describe the feature you'd like to be implemented
Create a couple of good, already predefined color presets with availability of customizing/deleting them.

[nitinsooni]

Did you finalize some presets bro? I've some themes in mind:-

Dark theme:-

• Background - rgb(0, 0, 0)
• Font - rgb(204, 204, 204)

Sepia theme:-

• Background - rgb(236, 225, 202)
• Font - rgb(100, 80, 50)

And light theme of app is fine.

[ConEstArthur]

Catpuccin colors would look nice I think. I'm currently using them on foliate.
https://github.com/catppuccin/foliate