Introduce frontend layout

GET poll.get -> /poll/{id} should be used for the single Poll page (details, option list, ...)
and so would be for a Call for proposal: GET call-for-proposal.get -> /call-for-proposal/{id}

The route/url couple for creating a CfP would then be something like call-for-proposal.new -> GET /call-for-proposal/new, while the page for posting the value and actually creating the CfP would be call-for-proposal.create -> POST /call-for-proposal