refactor: implement component-based architecture for enhanced maintainability

- Reorganize directory structure into core/, features/, and themes/
- Colocate application Nix logic, configs, scripts, and theme overrides
- Implement 'Inversion of Control' for theming: apps now pull theme-specific layouts
- Update flake.nix and shared library paths to match the new structure
- Document the new Feature-Centric architecture in README.md

themes/palettes/flexoki-light/colors.toml

@@ -0,0 +1,23 @@
+accent = "#205EA6"
+cursor = "#100F0F"
+foreground = "#100F0F"
+background = "#FFFCF0"
+selection_foreground = "#100F0F"
+selection_background = "#CECDC3"
+
+color0 = "#100F0F"
+color1 = "#D14D41"
+color2 = "#879A39"
+color3 = "#D0A215"
+color4 = "#205EA6"
+color5 = "#CE5D97"
+color6 = "#3AA99F"
+color7 = "#FFFCF0"
+color8 = "#100F0F"
+color9 = "#D14D41"
+color10 = "#879A39"
+color11 = "#D0A215"
+color12 = "#4385BE"
+color13 = "#CE5D97"
+color14 = "#3AA99F"
+color15 = "#FFFCF0"