chore: add type for import by eslint (#253)

src/shims.d.ts

@@ -4,7 +4,7 @@ declare interface Window {
 
 // with vite-plugin-md, markdowns can be treat as Vue components
 declare module '*.md' {
-  import { ComponentOptions } from 'vue'
+  import type { ComponentOptions } from 'vue'
   const component: ComponentOptions
   export default component
 }