organization: Remove Chris Wanstrath from Board of Directors

Chris has resigned from the Board, effective July 9, 2025.
His message:

> The org is now over a year old with strong leadership and momentum,
> so this feels like the right time to formally step away.
>
> I’m grateful to have helped get the non-profit off the ground,
> and the progress you all have made is inspiring.

Author: awesomekling

src/components/organization/leadership.astro

@@ -12,11 +12,6 @@ import Headshot from "./headshot.astro";
         title="President"
         image="/assets/img/leadership/andreas-kling.webp"
       />
-      <Headshot
-        fullName="Chris Wanstrath"
-        title="Secretary, Treasurer"
-        image="/assets/img/leadership/chris-wanstrath.webp"
-      />
       <Headshot
         fullName="Tim Flynn"
         image="/assets/img/leadership/tim-flynn.webp"