rework current front facing proxy (#40)

* replace previous caddy construct with kopano kweb
* add kweb to makefile
* greatly simplifies setup, if user wants to tweak config of kweb he could do so in git and make a local build. Fixes #22 
* ping kweb version
* update readme
* remove build argument from docker-compose for web and ldap-demo
* fix certificate handling in kweb. fixes #38

kweb/Dockerfile

@@ -0,0 +1,4 @@
+FROM kopano/kwebd:0.4.2
+COPY wrapper.sh /usr/local/bin
+COPY kweb.cfg /etc/kweb.cfg
+

kweb/kweb.cfg

@@ -0,0 +1,29 @@
+:8080 {
+    redir / https://{host}{uri}
+}
+
+*, :8443 {
+    gzip
+
+    tls {%EMAIL%}
+
+    redir 302 {
+        if {path} is /
+        / /webapp/
+    }
+
+    proxy /webapp/ kopano_webapp:80 {
+        transparent
+    }
+    redir /webapp /webapp/
+
+    proxy /Microsoft-Server-ActiveSync kopano_zpush:80 {
+        transparent
+    }
+
+    proxy /ldap-admin/ ldap-admin:80 {
+        without /ldap-admin
+        transparent
+    }
+    redir /ldap-admin /ldap-admin/
+}

kweb/wrapper.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+set -e
+
+if [ "$EMAIL" = "self_signed" ]; then
+	# do not use the '-host' option if using a self signed cert
+	exec kwebd caddy -conf /etc/kweb.cfg -agree
+else
+	exec kwebd caddy -conf /etc/kweb.cfg -agree -host "$FQDN"
+fi