Delete Container Linux toolbox

It's unmaintained, and has a dependency on rkt which is also unmaintained.
diff --git a/README.md b/README.md
index ecd6acc..5c3cdde 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,6 @@
 # toolbox - bring your tools with you
 
-toolbox is a small script that launches a container to let you bring in your favorite debugging or admin tools.
-
-There are currently two scripts that live within this repository:
- - toolbox: designed for Container Linux, uses rkt and systemd-nspawn
- - rhcos-toolbox: designed for Red Hat CoreOS, uses podman
+rhcos-toolbox is a small script, designed for RHEL CoreOS, that launches a podman container to let you bring in your favorite debugging or admin tools.
 
 ## Usage
 
@@ -25,20 +21,6 @@
 
 toolbox uses a Fedora-based userspace environment by default, but this can be changed to any Docker image. Simply override environment variables in `$HOME/.toolboxrc`:
 
-#### toolbox
-
-```
-core@core-01 ~ $ cat ~/.toolboxrc
-TOOLBOX_DOCKER_IMAGE=ubuntu-debootstrap
-TOOLBOX_DOCKER_TAG=14.04
-core@core-01 ~ $ toolbox
-Spawning container core-ubuntu-debootstrap-14.04 on /var/lib/toolbox/core-ubuntu-debootstrap-14.04.
-Press ^] three times within 1s to kill container.
-root@core-01:~# apt-get update && apt-get install tcpdump
-```
-
-#### rhcos-toolbox
-
 ```
 core@core-01 ~ $ cat ~/.toolboxrc
 REGISTRY=registry.redhat.io
diff --git a/toolbox b/toolbox
deleted file mode 100755
index a313e62..0000000
--- a/toolbox
+++ /dev/null
@@ -1,81 +0,0 @@
-#!/bin/bash
-
-set -e
-set -o pipefail
-
-machine=$(uname -m)
-
-case ${machine} in
-	aarch64 )
-		TOOLBOX_DOCKER_IMAGE=arm64v8/fedora
-		TOOLBOX_DOCKER_TAG=latest
-		;;
-	x86_64 )
-		TOOLBOX_DOCKER_IMAGE=fedora
-		TOOLBOX_DOCKER_TAG=latest
-		;;
-	* )
-		echo "Warning: Unknown machine type ${machine}" >&2
-		;;
-esac
-
-TOOLBOX_USER=root
-TOOLBOX_DIRECTORY="/var/lib/toolbox"
-TOOLBOX_BIND="--bind=/:/media/root --bind=/usr:/media/root/usr --bind=/run:/media/root/run"
-# Ex: "--setenv=KEY=VALUE"
-TOOLBOX_ENV=""
-
-toolboxrc="${HOME}"/.toolboxrc
-
-# System defaults
-if [ -f "/etc/default/toolbox" ]; then
-	source "/etc/default/toolbox"
-fi
-
-# User overrides
-if [ -f "${toolboxrc}" ]; then
-	source "${toolboxrc}"
-fi
-
-if [[ -n "${TOOLBOX_DOCKER_IMAGE}" ]] && [[ -n "${TOOLBOX_DOCKER_TAG}" ]]; then
-	TOOLBOX_NAME=${TOOLBOX_DOCKER_IMAGE}-${TOOLBOX_DOCKER_TAG}
-	have_docker_image="y"
-fi
-
-machinename=$(echo "${USER}-${TOOLBOX_NAME}" | sed -r 's/[^a-zA-Z0-9_.-]/_/g')
-machinepath="${TOOLBOX_DIRECTORY}/${machinename}"
-osrelease="${machinepath}/etc/os-release"
-if [ ! -f "${osrelease}" ] || systemctl is-failed -q "${machinename}" ; then
-	sudo mkdir -p "${machinepath}"
-	sudo chown "${USER}:" "${machinepath}"
-
-	if [[ -n "${have_docker_image}" ]]; then
-		riid=$(sudo --preserve-env rkt --insecure-options=image fetch "docker://${TOOLBOX_DOCKER_IMAGE}:${TOOLBOX_DOCKER_TAG}")
-		sudo --preserve-env rkt image extract --overwrite --rootfs-only "${riid}" "${machinepath}"
-		sudo --preserve-env rkt image rm "${riid}"
-	elif [[ -n "${TOOLBOX_DOCKER_ARCHIVE}" ]]; then
-		tmpdir=$(mktemp -d -p /var/tmp/)
-		trap "sudo rm -rf ${tmpdir}" EXIT PIPE
-		wget -O- "${TOOLBOX_DOCKER_ARCHIVE}" | xz -cd | tar -C ${tmpdir} -xf -
-		layer=$(find ${tmpdir} -name layer.tar -type f)
-		sudo tar -C ${machinepath} -xf ${layer}
-		trap - EXIT PIPE
-		sudo rm -rf ${tmpdir}
-	else
-		echo "Error: No toolbox filesystem specified." >&2
-		exit 1
-	fi
-	sudo touch "${osrelease}"
-fi
-
-# Special case for when SSH tries to pass a shell command with -c
-if [ "x${1-}" == x-c ]; then
-	set /bin/sh "$@"
-fi
-
-sudo SYSTEMD_NSPAWN_SHARE_SYSTEM=1 systemd-nspawn \
-	--directory="${machinepath}" \
-	--capability=all \
-        ${TOOLBOX_BIND} \
-        ${TOOLBOX_ENV} \
-	--user="${TOOLBOX_USER}" "$@"