Add gene visuals at the top of Gene pages on mi.org

[sagehrke]

We'd like to add visuals to the top summary of Gene node pages that are similar to the examples @Phillip-a-richmond made for a different purpose (see image).

We will likely need help from @Phillip-a-richmond to make sure the science is correct and @varun-divya to help build this. FYI: @kevinschaper