fix: fix keyframes docs imports

Author: alexgrozav

docs/content/docs/02.api/05.keyframes.md

@@ -261,7 +261,7 @@ Create reusable animation patterns by combining keyframes with utility selectors
 :::tabs-item{icon="i-lucide-code" label="Code"}
 
 ```ts
-import { styleframe, css } from 'styleframe';
+import { styleframe } from 'styleframe';
 
 const s = styleframe();
 const { keyframes, selector, ref } = s;