feat(system): comprehensive branding, styling, and system feature update

- Relocate themes to assets/themes/ and update all references.
- Implement custom SDDM theme and Plymouth theme enhancements.
- Add themed templates for Alacritty, Hyprland, Waybar, and other apps.
- Introduce Makima key remapper module and configuration.
- Add Voxtype and Walker configurations.
- Implement systemd power management and timeout optimizations.
- Add Nautilus-python extensions for LocalSend.
- Update branding assets and ASCII art integration.

assets/themes/gruvbox/colors.toml

@@ -0,0 +1,23 @@
+accent = "#7daea3"
+cursor = "#bdae93"
+foreground = "#d4be98"
+background = "#282828"
+selection_foreground = "#ebdbb2"
+selection_background = "#d65d0e"
+
+color0 = "#3c3836"
+color1 = "#ea6962"
+color2 = "#a9b665"
+color3 = "#d8a657"
+color4 = "#7daea3"
+color5 = "#d3869b"
+color6 = "#89b482"
+color7 = "#d4be98"
+color8 = "#3c3836"
+color9 = "#ea6962"
+color10 = "#a9b665"
+color11 = "#d8a657"
+color12 = "#7daea3"
+color13 = "#d3869b"
+color14 = "#89b482"
+color15 = "#d4be98"