assets: addition of CKEditor paths and shim fix
assets: addition of CKEditor paths and shim fix

* Improves settings for building assets with CKEditor.  (PR #3006)

Reviewed-by: Jiri Kuncar <2bdffcb416fed3002465740d19a053a39918cbe5@cern.ch>
Signed-off-by: Adrian Pawel Baran <3f0d95b8f073876984c6beaffa367600a8350ef3@cern.ch>

inveniosoftware/invenio-base,inveniosoftware/invenio-base,tiborsimko/invenio-base,tiborsimko/invenio-base