Issue #3256450 by navneet0693, tbsiqueira: Remove deprecated jQuery UI datepicker from socialblue

assets/css/brand.css

assets/css/datepicker.css

assets/css/preview.css

assets/css/timepicker.css

...nts/03-molecules/form-elements/datepicker/datepicker.scss

...nts/03-molecules/form-elements/timepicker/timepicker.scss

components/brand.scss

gulpfile.js

socialblue.info.yml

socialblue.libraries.yml