[##1159281] CFP - Redesign layout

* Add config to activate proposals
* Remove unnecesary paths from menu
* Replace img tags with rails image_tag helper
* Remove email from profile form
[#1159281] Add basic structure for new layout
[#1159281] Layout fixed
[##1159261] CFP - Edit/New Profile

* Adjust menu font styles
* Add content for titles
* Fix yield columns
* Refactor some css
[##1159471] CFP - Remove Profile Show

* Override profile controller create/update to redirect to root
* Remove show view
[#1159262] CFP - New Poposal

* Add new design of new proposal
* Add basic structure and styles for remaining days
Buttons of 'proposals' and 'new proposals' added