nginx: add separate endpoint for ip/setup screens

'setup' endpoint for setup/restore. we show the setup wizard.
'ip' endpoint is post activation. we show a splash screen here.

Also, the https://ip will not respond to any api calls anymore
(since this will leak the admin fqdn otherwise).

We should probably make this customizable at some point.

Fixes #739

src/cloudron.js

@@ -78,7 +78,7 @@ function onActivated(callback) {
     // 1. mail bounces can now be sent to the cloudron owner
     // 2. the restore code path can run without sudo (since mail/ is non-root)
     async.series([
-        reverseProxy.removeDefaultConfig, // remove IP based nginx config once user is created
+        (done) => reverseProxy.writeDefaultConfig({ activated :true }, done), // update IP based nginx config once user is created
         platform.start,
         cron.startJobs,
         function checkBackupConfiguration(callback) {
@@ -141,7 +141,7 @@ function runStartupTasks() {
                 // we remove the config as a simple security measure to not expose IP <-> domain
                 if (!activated) {
                     debug('runStartupTasks: not activated. generating IP based redirection config');
-                    return reverseProxy.writeDefaultConfig(callback);
+                    return reverseProxy.writeDefaultConfig({ activated: false }, callback);
                 }
 
                 onActivated(callback);