change

blog/.vitepress/theme/index.ts

@@ -0,0 +1,10 @@
+import Blog from "../../Blog.vue"
+import DefaultTheme from "vitepress/theme"
+
+/** @type {import("vitepress").Theme} */
+export default {
+    extends: DefaultTheme,
+    enhanceApp({ app }) {
+        app.component("Blog")
+    }
+}