chore: remove deprecated responsive embed mixins
chore: remove deprecated responsive embed mixins

zurb/foundation-sites,denisahac/foundation-sites,atmmarketing/foundation-sites,DaSchTour/foundation-sites,zurb/foundation-sites,denisahac/foundation-sites,atmmarketing/foundation-sites,DaSchTour/foundation-sites,zurb/foundation-sites,abdullahsalem/foundation-sites,abdullahsalem/foundation-sites,zurb/foundation,colin-marshall/foundation-sites,zurb/foundation,denisahac/foundation-sites,atmmarketing/foundation-sites,colin-marshall/foundation-sites,zurb/foundation,abdullahsalem/foundation-sites,colin-marshall/foundation-sites