Remove banner

Author: ai

src/sponsors/sponsors.pug

@@ -1,12 +1,5 @@
 section.sponsors
   h2.sponsors_title Sponsors
-  br
-  br
-  div( align="center" )
-    a( href="https://go.warp.dev/postcss" )
-      img( alt="Warp sponsorship" width="400" src="https://github.com/user-attachments/assets/ab8dd143-b0fd-4904-bdc5-dd7ecac94eae" )
-      br
-      | Warp, built for coding with multiple agents
   ul.sponsors_items
     li.sponsors_item.is-tailwindcss
       a.sponsors_link( target="_blank" rel="noopener" href="https://tailwindcss.com/" )