feat(conf): shiki config + layouts

setup/shiki.ts

@@ -1,11 +1,14 @@
 import type { ShikiSetupReturn } from '@slidev/types'
 import { defineShikiSetup } from '@slidev/types'
 
+import {
+  transformerNotationDiff,
+  transformerNotationErrorLevel
+} from '@shikijs/transformers'
+
 export default defineShikiSetup((): ShikiSetupReturn => {
   return {
-    themes: {
-      dark: 'vitesse-dark',
-      light: 'vitesse-light'
-    }
+    theme: 'one-dark-pro',
+    transformers: [transformerNotationDiff(), transformerNotationErrorLevel()]
   }
 })