Since Horizon doesn't build static files using npm, we don't need
to keep npm-relade configs.
Also this patch removes minified JavaScript files which are not
used directly by Horizon and lead to some issues with licenses
during packaging.
This commit prepares vitrage-dashboard to switch to use XStatic-*
packages instead of vendorized scripts by removing all unnecessary
files from the repo.
Change-Id: I33eda3d4cbb0911143deedafb1bce4ee7101e06f
Story: 2004051
Task: 27057