Add Sponsorship Page

[bndnio]

The sponsorship page should do two things:

• give a shoutout to existing sponsors that creates value for them, and
• presents the information for potential sponsors to help them make a decision in whether or not they should sponsor SIMBS. (to be done in a separate ticket)

This ticket only concerns the first point, thus the key new item to develop for this page is a slice to display sponsors.
Each sponsor should display their logo, name, level, description, and discount %.

Prior to developing, we should have a good idea of what the page will look like first, by creating a wireframe of the proposed design

[bndnio]

As a note: sponsors (of at least some tier) should receive a shoutout on the home page (handled in ticket #4)