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/miasma/colors.toml

@@ -0,0 +1,23 @@
+accent = "#78824b"
+cursor = "#c7c7c7"
+foreground = "#c2c2b0"
+background = "#222222"
+selection_foreground = "#c2c2b0"
+selection_background = "#78824b"
+
+color0 = "#000000"
+color1 = "#685742"
+color2 = "#5f875f"
+color3 = "#b36d43"
+color4 = "#78824b"
+color5 = "#bb7744"
+color6 = "#c9a554"
+color7 = "#d7c483"
+color8 = "#666666"
+color9 = "#685742"
+color10 = "#5f875f"
+color11 = "#b36d43"
+color12 = "#78824b"
+color13 = "#bb7744"
+color14 = "#c9a554"
+color15 = "#d7c483"