Update landing page...and now several other pages

[llevitis]

• [x] fixed relative path for "about" subsection
• [x] updated favicon folder to include files derived from the brainhack logo image
• [x] updated team page
• [x] added tentative schedule for the 1st day
• [x] deleting a bunch of files that were carried over from the Eventure template
• [x] added a transparent border for the "OHBM Brainhack 2020" section
• [x] updated the icon that appears in the nav but it doesn't appear otherwise (?) & we should probs add some text to it