removing package.json and Gemfile for the req files list

This was causing problems when gather_assets ran

playbooks/roles/edxapp/defaults/main.yml

@@ -144,8 +144,6 @@ edxapp_all_req_files:
   - "{{ sandbox_base_requirements }}"
   - "{{ sandbox_local_requirements }}"
   - "{{ sandbox_post_requirements }}"
-  - "{{ edxapp_code_dir }}/package.json"
-  - "{{ edxapp_code_dir }}/Gemfile"
 
 # TODO: old style variable syntax is necessary
 # for lists and dictionaries