chore(scss/mixins/cosmetics): $map => $values
improve(scss/cosmetic): restructurises modules
improve(scss/base/button): permits selection of the insides
improve(scss/base/choicebox): finely positions
fix(scss/base/menu): prevents current item background to be overriden by link's one
improve(scss/base/rich): prevents margin-top to be nulled if the `rich` block is not first-child
improve(scss/base/textbox): finely tunes different control types appliance
improve(js/docs/example-directive): does more cleanup while processing HTML
improve(scss/project/example): provides more space for the menu
improve(js/docs): updates the content