Remove treasuremap from airship docs main page

The treasuremap documentation publishes to the front page of the airship
docs website; however, the main landing page of the airship docs website
should be the contents of the airship/docs repository. This commit
changes the promotion job to publish to a subdirectory of our
documentation website.

Change-Id: Idf778201c83e0157d938b3fb77fd4c97f7cd0d76
Signed-off-by: Drew Walters <andrew.walters@att.com>

.zuul.yaml

@@ -14,8 +14,8 @@
     templates:
       - docs-on-readthedocs
     vars:
-      rtd_webhook_id: '47687'
       rtd_project_name: 'airship-treasuremap'
+      rtd_webhook_id: '47687'
     check:
       jobs:
         - treasuremap-seaworthy-site-lint
@@ -39,7 +39,7 @@
         - treasuremap-upload-git-mirror
     promote:
       jobs:
-        - promote-airship-docs-website
+        - promote-airship-project-docs
 
 
 - nodeset: