move to s6 overlay structure (#13)

* move to s6 overlay structure

* Use alpine:latest and latest s6

* cleanup Dockerfile

* use .env file on docker run

* change mappings so all under one folder

* Update README

* change cron default to hourly to keep things updated

* add section about editing xteve settings

* add nice 'logging' to stdout

root/etc/cont-init.d/10-adduser

@@ -0,0 +1,14 @@
+#!/usr/bin/with-contenv bash
+
+groupmod -o -g "$PGID" abc
+usermod -o -u "$PUID" abc
+
+echo '
+-------------------------------------
+GID/UID
+-------------------------------------'
+echo "
+User uid:    $(id -u abc)
+User gid:    $(id -g abc)
+-------------------------------------
+"