Add Airship subproject documentation job

The airship/treasuremap project publishes to docs.airshipit.org, but
other airship repositories cannot publish to the same site. This change
adds a separate job that enables other Airship repositories to promote
their documentation to a subdirectory of the main documentation site.
This change also replaces airship/treasuremap with airship/docs as the
main documentation repository.

Change-Id: I703ac705b549f4f4a7bc24d37a63b88035b5e892
Signed-off-by: Drew Walters <andrew.walters@att.com>

zuul.d/jobs.yaml

@@ -456,10 +456,34 @@
       Promote root site content for docs.airshipit.org to airshipit.org/docs.
     final: true
     allowed-projects:
-      - airship/treasuremap
+      - airship/docs
     vars:
       publish_site: "airshipit.org/docs"
 
+- job:
+    name: promote-airship-project-docs
+    parent: promote-tox-docs-site-base
+    description: |
+      Promote subproject doc content for docs.airshipit.org site.
+    final: true
+    allowed-projects:
+      - airship/airshipctl
+      - airship/airshipui
+      - airship/armada
+      - airship/deckhand
+      - airship/divingbell
+      - airship/drydock
+      - airship/pegleg
+      - airship/porthole
+      - airship/promenade
+      - airship/shipyard
+      - airship/specs
+      - airship/spyglass
+      - airship/spyglass-plugin-xls
+      - airship/treasuremap
+    vars:
+      publish_site: "airshipit.org/docs/{{ zuul.project.short_name }}"
+
 - job:
     name: promote-governance-election
     parent: promote-tox-docs-site-base