🔧 holmium: Move https ingress for XMPP server

The http(s) stuff for jabber.n39.eu was a static page before.  We point
that to a static-webserver container on pottwal next to the xmpp server
container for now.

holmium.yml

@@ -9,10 +9,6 @@
     - role: nginx-https-ingress
       vars:
         ingress:
-          - server: helium
-            hosts:
-              - name: jabber.n39.eu
-              - name: conference.jabber.n39.eu
           - server: kant
             hosts:
               - name: spaceapi.n39.eu
@@ -29,6 +25,8 @@
               - name: pad.n39.eu
               - name: brotherql-web.n39.eu
                 local: true
+              - name: jabber.n39.eu
+              - name: conference.jabber.n39.eu
           - server: radon
             hosts:
               - name: nodered.n39.eu