Add slider's nav to prev and next for the project page
Change opacity of the nav on project page
Reduce the margin from header and slider on project page
Merge branch 'new-slider-on-work-page' of github.com:Helabs/helabs.github.com into new-slider-on-work-page

Conflicts:
	_layouts/case.html
	sass/modules/_cases.scss
Increase the size of the description on the header of the project page