Replace doctype icons

The doctype icons don't respect the heuristic of the match between the system and the real world. These icons aren't clear to the users and we need to replace it for icons that are meaningful. We have also found other inconsistent icons such as filled icons (our platform uses outlined icons) and icons in which the outline is too thin. Therefore we have new icons to replace these and create consistency and clarity on our platform.

Icons are on attachment with the respective icon name.