make docker-compose easier to use (also by introducing variables and a setup script)

update Dockerfiles/Makefile for use with kopano supported build
introduce a local ldap image with some demo users
include caddy for reverse proxying
add proper documentation and remove obsolete build and push scripts

Signed-off-by: Felix Bartels <felix@host-consultants.de>

ssl/start.sh

@@ -1,8 +1,7 @@
 #!/bin/sh
 
-
-if [ -f /kopano/ssl/ca.pem ]
-  then exit 0
+if [ -f /kopano/ssl/ca.pem ]; then
+	exit 0
 fi
 
 /gencerts.sh