chore(whole Project): cleanup html structure

-- remove inline styles for most elements
-- use common design for all sites
-- use bootstrap structure as often as possible

Related to: #CAM-1073
chore(whole page): cleanup css & change layout

-- change layout from default to dark because we don't need a wrapper
-- remove unused css properties (saved us 201 Line css code without
minification v(^-^) )
-- fix little design issues because of check and removement of unused css
code

Related to: #CAM-1073
chore(whole page): add minifier and minify sites

-- add gruntfile and tasks to minify css/js/html
-- downloaded some images to reduce loading time
-- reduce loading time of startpage with async twitter script

Realted to: #CAM-1073
fix(idea): fix logo path
chore(start-page): rebuild start page

-- add carousel
-- add typical users
-- move buttons into nav
-- add more tweets and remove scrollbar

Related to: #CAM-1073 and #CAM-1175