Add TC repo project-navigator-data

We need a repo into which we can put the project-navigator data. How
about calling it "project-navigator-data"?

Change-Id: I6e15a8b1f433107b84dd6734f68c77d54a9ff793

reference/technical-committee-repos.yaml

@@ -4,6 +4,7 @@ Technical Committee:
   - repo: openstack/governance
   - repo: openstack/openstack-specs
   - repo: openstack/api-wg
+  - repo: openstack/project-navigator-data
   - repo: openstack/project-team-guide
   - repo: openstack/service-types-authority
   - repo: openstack/election