generalize addsubdomain to work with different locations

scripts/addsubdomain/subdomain.dmz.rs.http

@@ -0,0 +1,10 @@
+server {
+	listen 80;
+	listen [::]:80;
+
+	index index.html index.htm index.nginx-debian.html;
+
+	server_name subdomain.dmz.rs subdomain.decentrala.org;
+
+	root /var/www/subnodotdmzrs;
+}