Add repo settings and remove highlights for Newton

We've deprecated per-release highlights and are now removing them.
We also now require repository-settings for deliverables. This adds
the one and removes the other.

Change-Id: Ia94eb26ccc9552193e9a21e5c771ce962721f6c9

deliverables/newton/designate-dashboard.yaml

@@ -19,8 +19,6 @@ releases:
     projects:
       - repo: openstack/designate-dashboard
         hash: 66090cb190ce0bb6ff2bacd1bf586b043c4f8151
-    highlights: |
-      Added the new Designate v2 API Dashboard
   - version: 3.0.0.0rc2
     projects:
       - repo: openstack/designate-dashboard
@@ -34,3 +32,5 @@ releases:
     projects:
       - repo: openstack/designate-dashboard
         hash: ce5774b8ec6665b70dbdd032c1466a38fd674034
+repository-settings:
+  openstack/designate-dashboard: {}