Add sponsor logo background.

Author: nikoshell

src/components/SocialMediaSponsorCard.astro

@@ -49,7 +49,7 @@ const y = 650 - height / 2;
     d="
        m 885 885 l -240 0 a 240 240 0 0 1 -240 -240 a 240 240 0 0 1 240 -240 a 240 240 0 0 1 240 240 z
        "
-    fill="white"
+    fill="#EDE1D1"
     stroke="#F5B91A"
     stroke-width="8"
   />