Nxstage 1628 cont learning search

src/components/hy-dropdown/hy-dropdown.scss

src/components/hy-filter-group/hy-filter-group.item.tsx

src/components/hy-filter-group/hy-filter-group.scss

src/components/hy-filter-group/hy-filter-group.tsx

src/components/hy-list-item/hy-list-item.scss

src/components/hy-list-item/hy-list-item.tsx

src/components/site-header/site-logo/readme.md

src/components/site-header/site-search/readme.md

src/index.html

src/utils/utils.ts