chore(theme): drop bottom-right CC BY-NC attribution from rick-morty

Removes the visual attribution block — code-comment provenance still
documents the source.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: functionstackx

packages/app/src/components/rick-morty/rick-morty-decorations.tsx

@@ -138,30 +138,6 @@ export function RickMortyDecorations() {
           style={{ width: 'min(220px, 18vw)' }}
         />
       </div>
-
-      <div className="hidden lg:block fixed bottom-1 right-2 z-0 text-[10px] text-foreground/50 text-right leading-tight">
-        <div>
-          art:{' '}
-          <a
-            href="https://pngimg.com/"
-            target="_blank"
-            rel="noopener noreferrer"
-            className="underline hover:text-foreground"
-          >
-            pngimg.com
-          </a>
-        </div>
-        <div>
-          <a
-            href="https://creativecommons.org/licenses/by-nc/4.0/"
-            target="_blank"
-            rel="noopener noreferrer"
-            className="underline hover:text-foreground"
-          >
-            CC BY-NC 4.0
-          </a>
-        </div>
-      </div>
     </>
   );
 }