remove some "$" usage in instructions, theres no good way to escape it in nginx literals

bump to 0.2.4

nginx.conf

@@ -124,23 +124,13 @@ http {
         location /setup/systemd {
             add_header "Content-type" "text/plain" always;
             return 200 '
-set -e 
+set -e
 
-if [ ! -d /etc/systemd ]; then   
+if [ ! -d /etc/systemd ]; then
    echo "Not a systemd system"
    exit 1
 fi
 
-if [[ $EUID -ne 0 ]]; then
-   echo "Must be root to change system files"
-   exit 1
-fi
-
-if [[ $(systemctl is-active --quiet docker.service) -ne 0 ]]; then
-   echo "Docker service missing"
-   exit 1
-fi
-
 mkdir -p /etc/systemd/system/docker.service.d
 cat << EOD > /etc/systemd/system/docker.service.d/http-proxy.conf
 [Service]