cdn: remove fallback config that would never be used

cdn/tasks/main.yml

@@ -2,7 +2,7 @@
 
 - name: include debian version specific vars
   include_vars:
-    file: "{{debian_version|default('fallback')}}.yml"
+    file: "{{ ansible_distribution_release }}.yml"
 
 - name: install commonly used web libraries
   apt:

cdn/vars/fallback.yml

----
-
-cdn_packages:
-  - libjs-jquery
-  - libjs-bootstrap
-  - libjs-jquery-datatables
-  - libjs-jquery-ui