Revert "Upgrade from angularjs (v1) to angular (v6)"

This reverts commit 36aecc1229.
This reverts commit 683f50ed55.

This caused zuul.openstack.org to attempt to GET "https://api/status".

Change-Id: Ib25356f7ea5bfeec84e91195ac161d497f74d73d

playbooks/dashboard/multi.yaml

@@ -1,11 +0,0 @@
-- hosts: all
-  tasks:
-
-    - name: Make symlinks to allow multi-tenant preview to work
-      file:
-        src: .
-        dest: '{{ zuul.project.src_dir }}/{{ javascript_content_dir }}/{{ item }}'
-        state: link
-      with_items:
-        - local
-        - t

playbooks/dashboard/run.yaml

@@ -1,18 +0,0 @@
-- hosts: all
-  roles:
-    - revoke-sudo
-    - set-zuul-log-path-fact
-    # Both sets of quotes are required.
-    # The "" quotes are for the shell to protect the '' quotes.
-    # We need the '' quotes because defines here are essentially
-    # direct string substitutions. Therefore:
-    #   --define "ZUUL_API_URL='https://zuul.openstack.org'"
-    # with the javascript code:
-    #   return ZUUL_API_URL
-    # results in
-    #   return 'https://zuul.openstack.org'
-    # in the compiled javascript.
-    - role: npm
-      npm_command: >-
-        build:dist --
-          --define "ZUUL_API_URL='{{ zuul_api_url }}'"