Add a page with information about the Brigade leadership team

[tdooner]

Now that there's more than just Christopher, we should add a page that lists people that are in leadership positions throughout the network.

I'm thinking:

• Christopher, Erie, and myself (and anyone who joins the team)
• NAC members
• BAT leaders

For each person:

• Name
• Photo
• A way to contact them - their handle in slack perhaps
• A link to the BAT