[UI]: Homepage Layout

[kcullion]

Goal: The layout and style for the homepage: zeplin: https://zpl.io/aMoJPZR

• [x] 1. Intro blurb (Apply for Access button will link to the modal built in https://github.com/icgc-argo/dac-ui/issues/7)
• [x] 2.What will you get access for?. Please link the ARGO logo and ICGC ARGO text link to https://platform.icgc-argo.org/ (open in a new window) and the ICGC logo and ICGC 25K Data Portal links to https://dcc.icgc.org/ (open in a new window). The PCAWG text links to https://dcc.icgc.org/pcawg (open in a new window)
• [x] 3. Overview (bottom faqs link TBD)
• [x] 4. Application Process (eligible project team link TBD)

Note: the banner image is still being decided on. Let me know if you need a placeholder image

[rosibaj]

@samrichca this look great; thank you very much!