Add autoconfig.xml

- Reordered some items to make rendered diagram easier to follow.

Author: cliffmccarthy

ARCHITECTURE.md

@@ -10,11 +10,14 @@ graph LR;
     acmetool --> certs;
     acmetool --> acmetool-redirector;
     acmetool-redirector --> certs;
+    nginx --> /var/www/html;
     nginx --> certs;
+    nginx --> newemail.py;
     nginx --> postfix;
+    nginx --> autoconfig.xml;
     nginx --> dovecot;
-    nginx --> newemail.py;
-    nginx --> /var/www/html;
+    autoconfig.xml --> postfix;
+    autoconfig.xml --> dovecot;
     postfix --> certs;
     postfix --> vmail;
     postfix --> filtermail;