serve dnslink over http

docker/caddy/Caddyfile

@@ -7,6 +7,10 @@
         on_demand
     }
 
+    reverse_proxy nginx:80
+}
+
+:80 {
     reverse_proxy nginx:80 {
         # add Dnslink-Lookup header so nginx knows that the request comes from a domain
         # outside of our certificate string and should perform a dnslink lookup