support overriding DOC_LINK_BASE_URL

playbooks/roles/edxapp/defaults/main.yml

@@ -286,6 +286,8 @@ EDXAPP_LANG: 'en_US.UTF-8'
 EDXAPP_LANGUAGE_CODE : 'en'
 EDXAPP_TIME_ZONE: 'America/New_York'
 
+EDXAPP_DOC_LINK_BASE_URL: 'http://edx.readthedocs.io/projects/open-edx-learner-guide'
+
 EDXAPP_TECH_SUPPORT_EMAIL: 'technical@example.com'
 EDXAPP_CONTACT_EMAIL: 'info@example.com'
 EDXAPP_BUGS_EMAIL: 'bugs@example.com'
@@ -871,6 +873,7 @@ generic_env_config:  &edxapp_generic_env
   SUPPORT_SITE_LINK: "{{ EDXAPP_SUPPORT_SITE_LINK }}"
   CDN_VIDEO_URLS: "{{ CDN_VIDEO_URLS }}"
   PERFORMANCE_GRAPHITE_URL: "{{ PERFORMANCE_GRAPHITE_URL }}"
+  DOC_LINK_BASE_URL: "{{ EDXAPP_DOC_LINK_BASE_URL }}"
 
   # repo root for courses
   GITHUB_REPO_ROOT: "{{ edxapp_course_data_dir }}"