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/matte-black/colors.toml

@@ -0,0 +1,23 @@
+accent = "#e68e0d"
+cursor = "#eaeaea"
+foreground = "#bebebe"
+background = "#121212"
+selection_foreground = "#bebebe"
+selection_background = "#333333"
+
+color0 = "#333333"
+color1 = "#D35F5F"
+color2 = "#FFC107"
+color3 = "#b91c1c"
+color4 = "#e68e0d"
+color5 = "#D35F5F"
+color6 = "#bebebe"
+color7 = "#bebebe"
+color8 = "#8a8a8d"
+color9 = "#B91C1C"
+color10 = "#FFC107"
+color11 = "#b90a0a"
+color12 = "#f59e0b"
+color13 = "#B91C1C"
+color14 = "#eaeaea"
+color15 = "#ffffff"