creating files for html section

translated version in new branch
translated css section to polish
translating section of images
Update scale.html.md

fix a typo
Update selectors.html.md

fix a typo
new files for js, jquery and bonus sections
new sections for server
Fixing typo

I believe it is supposed to be written this way.
adding intro files in polish
Merge remote-tracking branch 'origin/HEAD' into version-pl
responsive improvements in content
responsive: edit link removed from small views, since github isn't responsive
responsive: better header, scaling with ems
responsive: ios needs initial-scale to adjust on orientation change
hiding anchor link too
Merged #160
Added PL lang configs #160
Added Poland flag
Merged #169
Added flags for ZH #169