CLC-2068 - Implement new design for splash page
https://jira.media.berkeley.edu/jira/browse/CLC-2068

Also fixes a subtask:
CLC-2238 - IMPLEMENT: Add "Beta" back to the CalCentral brand and Splash page
Merge pull request #1332 from christianv/CLC-2068

CLC-2068 - Implement new design for splash page