Colorscheme support

[shadow-absorber]

Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] shadow is always frustrated when applications don't follow the theme shadow uses for all their apps on their computer

Describe the solution you'd like A clear and concise description of what you want to happen. using gtk or qt themes or having some config file for colorschemes where people could create their own ones

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered. trying other rss readers but none are as good as fluent-reader wanting catppuccin or dracula colorscheme support

Additional context Add any other context or screenshots about the feature request here.