Uses background-size: cover (like Medium) to scale the image
Sets project poster as background-image for greater control
Sets max-width of project poster to 1600px (dark background)
Changes hover animation for project icons
Enables new background + logo for project poster
Deprecates old style (single image)
Documents in README
Updates chanjo resources to adapt to new project poster format
PNG => SVG
Merge pull request #18 from SciLifeLab/robin/restrict-poster-image

Restricts project poster to 1600px
Adds first draft of text for SciLifeLab website
Just some improvements to the text
Incorporate @ewels suggestions from #17
Merge branch 'robin/scilifelab-intro' of https://github.com/SciLifeLab/scilifelab.github.io into robin/scilifelab-intro