docs: add note about importing optional components when using no fonts default theme

docs/guide/extending-default-theme.md

@@ -58,6 +58,10 @@ export default DefaultTheme
 }
 ```
 
+:::warning
+If you are using optional components like the [Team Page](/reference/default-theme-team-page) components, make sure to also import them from `vitepress/theme-without-fonts`!
+:::
+
 If your font is a local file referenced via `@font-face`, it will be processed as an asset and included under `.vitepress/dist/assets` with hashed filename. To preload this file, use the [transformHead](/reference/site-config#transformhead) build hook:
 
 ```js