Update Extend docs with more mobile specific content from the Wiki
Update Extend docs with more mobile specific content from the Wiki

filtercake/mobile-boilerplate-timetable-3,xzcb2008/mobile-boilerplate,h5bp/mobile-boilerplate,h5bp/mobile-boilerplate,COBSNAN/mobile-boilerplate,texnixe/test,xieQin/mobile-boilerplate,perfect-pixell/mobile-boilerplate,wjb12/mobile-boilerplate,Saajan/uber-mobile,jamesandersen/jamesandersen.github.io,Cheeriohz/mobileWebPage,cyprianos/bold,globalepub/mobile-boilerplate,wjb12/mobile-boilerplate,cyprianos/bold,xieQin/mobile-boilerplate,jamesandersen/jamesandersen.github.io,xzcb2008/mobile-boilerplate,fogbrain00/mobile-boilerplate,Saajan/uber-mobile,perfect-pixell/mobile-boilerplate,COBSNAN/mobile-boilerplate,filtercake/mobile-boilerplate-timetable-3,globalepub/mobile-boilerplate