chore(timeline): exclude styles

-- use the positioning only in stages
chore(home): use aside instead div
chore(headings): distances after headings
chore(icons): use margin-bottom for icons (images)
feat(tooltips): different directions and mixin

-- use mixin triangle for generating an arrow with a direction
-- different positions for the tooltips
fix(layout): use the new layout-name for the seperator
Version 0.4.0