added social links to investor cards. For the design, I went with atul's idea to have the social icons justified to the left. I also went with the white hover tint because after a second thought, I felt the colors seemed a bit too "loud" especially since everything is black/white. This diff also adds Ranjan Pradeep to the investor directory.
Linear Task: ENG-1953
Figma: Investor Page
Depends on D5390