Update arch setup, particularly for WSL

[kergoth]

• Revisit os setup in os-install, as parts of this should migrate to setup-system
  • Set root password
  • Add staff group
  • Adjust /usr/local permissions
  • Set hostname? Keep in os-install?
  • Set timezone
  • Set up console font if non-ephemeral and non-WSL
  • Install and enable dhcpcd - keep in os-install
  • Install vi, net-tools, zsh - remove entirely, or keep just net-tools
  • Install and set up bootloader - keep in os-install
  • Set up initramfs - keep in os-install
• Set up pacman keyring
• Change ArchWSL default user if using ArchWSL
• Adjust /etc/wsl.conf if necessary

Reference

• How to Set Up ArchWSL