docs: remove unused keys

Author: atinux

docs/app.config.ts

@@ -2,17 +2,5 @@ export default defineAppConfig({
   ui: {
     primary: 'green',
     gray: 'slate',
-  },
-  elements: {
-    variables: {
-      light: {
-        background: '255 255 255',
-        foreground: 'var(--color-gray-700)',
-      },
-      dark: {
-        background: 'var(--color-gray-950)',
-        foreground: 'var(--color-gray-200)',
-      },
-    },
-  },
+  }
 })