fix(types): fix broken syntax in theme.d.ts (#1101)

Author: brc-dd

theme.d.ts

@@ -1,14 +1,14 @@
 // so that users can do `import DefaultTheme from 'vitepress/theme'`
-import { ComponentOptions } from 'vue'
+import type { ComponentOptions } from 'vue'
 
-export const VPHomeHero = ComponentOptions
-export const VPHomeFeatures = ComponentOptions
-export const VPHomeSponsors = ComponentOptions
-export const VPDocAsideSponsors = ComponentOptions
-export const VPTeamPage = ComponentOptions
-export const VPTeamPageTitle = ComponentOptions
-export const VPTeamPageSection = ComponentOptions
-export const VPTeamMembers = ComponentOptions
+export const VPHomeHero: ComponentOptions
+export const VPHomeFeatures: ComponentOptions
+export const VPHomeSponsors: ComponentOptions
+export const VPDocAsideSponsors: ComponentOptions
+export const VPTeamPage: ComponentOptions
+export const VPTeamPageTitle: ComponentOptions
+export const VPTeamPageSection: ComponentOptions
+export const VPTeamMembers: ComponentOptions
 
 declare const theme: {
   Layout: ComponentOptions