style html elements

[vitopepito]

currently, the elements are not styled properly. [x] create main-style.css [x] add a custom font [x] style all elements as they appear in /pages/cheatsheet [x] create two styles, one for green and one for red, maybe like main-color-green.css ++ [x] style knowledge-base

[vitopepito]

[] style tables (maybe useful?) [] style ol list type [x] style ul list-type [x] hr horizontal line [x] titles and subtitles in #content with accurate size and margins

[vitopepito]

[x] maybe make the font light weight

[vitopepito]

[x] make general look a bit more light and more like the old page [x] align logo with content [x] make the link underline on the link-box disappear, probably by renaming the classes