Rename Brain and AI to Instruction and write BAWANA in capitals

The page now lives at /instruction; /brain and /perintah redirect there.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/components/Icon.tsx

@@ -54,7 +54,7 @@ export function Brand() {
   return (
     <span className="brand">
       <span className="brand-mark"><Icon name="book" /></span>
-      <span>Learning Lab <b>Express</b><small>by Bawana</small></span>
+      <span>Learning Lab <b>Express</b><small>by BAWANA</small></span>
     </span>
   )
 }