remove devbox command

 On branch master

	deleted:    TODO.md
	deleted:    bin/devbox
	deleted:    completions/devbox.bash
	deleted:    completions/devbox.zsh
	deleted:    libexec/devbox
	deleted:    libexec/devbox-build
	deleted:    libexec/devbox-commands
	deleted:    libexec/devbox-completions
	deleted:    libexec/devbox-help
	deleted:    libexec/devbox-init
	deleted:    libexec/devbox-sh-shell
	deleted:    virtual_machines/base/Vagrantfile
	deleted:    virtual_machines/devbox/Vagrantfile