provide mechanism for custom .well-known handlers and static files (e.g. for letsencypt ownership verification). Document that if you create a .well-known directory to validate a letsencrypt cert you need to remove it before installing hubzilla. We probably need a check for this in the install checklist.

mod/hostxrd.php

@@ -12,6 +12,7 @@ function hostxrd_init(&$a) {
 	));
 	$arr = array('xrd' => $x);
 	call_hooks('hostxrd',$arr);
+
 	echo $arr['xrd'];
 	killme();
 }