Update the one-shot script to set screen rotation using kanshi based on kernel command line parameters, replacing the previous wlr-randr method. The script now writes the configuration to ~/.config/kanshi/config and sets the GTK dark theme (PiXnoir or Adwaita-dark) at first login. Additionally, enhance documentation to reflect these changes and clarify the role of the new script in the first-boot process.
Revise the first-boot script to implement a structured approach with 13 numbered steps, allowing for better control over the execution order. Introduce two new one-shot scripts: `01-set-rotation-once.sh` and `02-set-wallpaper-once.sh`, replacing the previous single script approach. Update documentation to reflect these changes, including the new configuration options for enabling/disabling steps and the revised file structure for one-shot scripts. Enhance the dashboard to display first-boot progress, improving user feedback during the initial setup.
