Add NY datathon webpage (publish Sept 16)

[SamFritz]

Addresses Add Webpage for fourth datathon #134

This PR incorporates the following information onto the webpage:

• Intro image (save the date)
• Information about the datathon
• Organizers
• Sponsor logos
• Important Dates
• Submission details
• Travel grants

Change from previous datathon pages: sponsor logos were created/displays as a single .png rather then in a table format which alters logo size too much.

Test/Review @ianmilligan1 @ruebot would appreciate eyes on this page just to make sure we haven't left out any important details, graphics/visuals display nicely, etc. There is no rush, just want to prep the PR. Always happy for any style/content suggestions! Edits completed on ny-datathon branch

Note: Let's publish on Sept 16, 2019 pls. Don't want webpage to be visible before save the date goes out on Sept. 9. Thanks!!

[SamFritz]

Let's Merge this PR on Monday when the CFP goes live :)