Old class names

[ehanahamed]

stuff like html.screen need to be removed, i already made new, better, classes to replace those

stuff like .flex.justifyselfcenter are useful utilities, but have irregular capitalization or annoying wording/names, those need new/improved class names. Sometimes we should keep the old classnames in addition to the new one for "compatability", like with .flex.alignCenter, .flex.center-v (changed in 7f01112)