Update with suggestions:

- Add ADR describing Plugin Contexts
- Remove app-specific constants from framework-level code
- Add dashboard constants to student app with README

openedx/core/djangoapps/plugins/constants.py

@@ -77,11 +77,6 @@ class PluginSignals(object):
     RELATIVE_PATH = u'relative_path'
     DEFAULT_RELATIVE_PATH = u'signals'
 
-
-class PluginContextsViews(object):
-    COURSE_DASHBOARD = u'course_dashboard'
-
-
 class PluginContexts(object):
     """
     The PluginContexts enum defines dictionary field names (and defaults)
@@ -89,6 +84,3 @@ class PluginContexts(object):
     additional views it would like to add context into.
     """
     CONFIG = u"context_config"
-
-    VIEWS = PluginContextsViews
-