refactor: migrate to whiskers

[fruzitent]

TODO

• RGBA -> ARGB add hex formatting options to frontmatter whiskers#8
• mkdir -p before writing to file feat(whiskers): create needed parent directories by default toolbox#182

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You can do ARGB with a Tera macro by the way. Also I'd recommend adding a justfile like https://github.com/catppuccin/fr33zmenu/blob/main/justfile to build with Whiskers and create the zips or whatever else you are doing, and you should move the templates into templates/xyz.tera instead of mimicking the output directory structure.

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Welp you've already merged it 😅 I'd still recommend refactoring to remove the excess usage of flavor.colors.