Update the Landing Page on mi.org

[sagehrke]

Ideally, we want a landing page that shows the different products and doesn’t make it hard for people to start the search.

• Replace the phrase “Explore our knowledge…” with Monarch’s vision: "Accelerating precision medicine through Open Data Science."
• Move the “What is Monarch” segment down and add the foundational projects at the top (from the “resources” page) above the search bar.
• Need somewhere to put the NIH ORIP video - potentially is should be on the new landing page.
• Reword the text on the foundational product buttons

[amc-corey-cox]

I think we have all of these completed now, in the UI update branch/PR attached.