[WIP] New slider on work page

Don't merge it! #406 

### Design:
- [x] Create a mockup with the new style with slider
- [ ] Create 5 pictures of each project

### Front-end:
- [x] Create the script to the slider using cycle2
- [x] Front-end of the slider
- [x] Make better next/prev icons with links, not pseudo elements to trigger on cycle2 JS
- [ ] Show captions for each photo on slide

### Back-end
- [x] Add captions for each photo on slide
- [X] Add screenshots links to md configuration and iterate on view.

### QA:
- [x] Verify the english pages
- [x] Verify the responsive way