fix(examples): replace inline styles with classes

-- inline styles are not best practise and have the following draw backs
---- inline styles removes the maintainability of a site
---- inline styles could create problems with some older text to speech devices
---- inline styles cause problems with search engines
---- inline styles blow up the site size and with this also the traffic

So you better don't use inline styles!

Closes: #CAM-1318
fix(examples): add breadcrumbs navigation

-- add breadcrumbs
-- remove now unused class real-life-spacer

Closes: #CAM-1319
fix(renderer): add default flow behavior

-- we can now show default flows in renderer
-- removed external gif for fixing IE hover bug.... using proven non-external rgba(0,0,0,0) version

Closes: #CAM-1296
impr(history): illustration
Merge branch 'master' of github.com:camunda/docs.camunda.org
impr(history): provide sources for images
Merge branch 'master' into live
Merge branch 'live' of github.com:camunda/docs.camunda.org into live