CampaignChain/campaignchain#192 Subsume all app-wide parameters under…

… campaignchain_core using tree builder

open/administrator/configuration/overview.rst

@@ -12,15 +12,35 @@ App-wide Parameters
 Parameters that configure the app-wide framework are prefixed with
 ``campaignchain.`` and defined in two files:
 
-* ``app/config/parameters.yml`` contains the parameters that should be
-  considered during installation.
-* In ``app/config/config_campaignchain.yml``, you will find other app-wide
-  parameters, which contain default values that should be fine for most
-  installations of CampaignChain.
+* *app/config/parameters.yml* contains the parameters that should be
+  considered during installation under the ``parameters`` key.
+* In *app/config/config_campaignchain.yml*, you will find other app-wide
+  parameters (again under the ``parameters`` key), which contain default values
+  that should be fine for most installations of CampaignChain.
+
+For example, in *parameters.yml*, there's this option to define the route of
+the tracking script:
+
+.. code-block:: yaml
+
+    parameters:
+        campaignchain.tracking.js_route: /tracking.js
 
 Bundle-specific Parameters
 --------------------------
 
 Each bundle or module might define its own configuration options. These are all
 listed in *app/config/config_campaignchain_bundles.yml* under an alias for each
 bundle, e.g. ``campaignchain_core``.
+
+For example:
+
+.. code-block:: yaml
+
+    campaignchain_core:
+        env: prod
+        tracking:
+            id_name: cctid
+            js_mode: prod
+            js_class: CCTracking
+            js_init: cc