SAK-40227 Removing bower package manager from Rubrics - Removed bower, gulp and related files. - Referenced polymer related libraries via webjars. - Substituted deprecated polymer-bootstrap library for granite-bootstrap. - PENDING: scss management (see SAK-41081). - PENDING: use includewebjars methods for Sortable and Webcomponentsjs library calls. - Located static content for springboot with maven plugin.
(clearing browser's cache might be needed for this to take effect)
(cherry picked from commit 17fc8996f683df04a1b704b3b22f458277891652)