fix: import of button (#978)

Author: ematipico

src/content/blog/astro-430.mdx

@@ -100,7 +100,7 @@ This type export allows you to reference the `Props` accepted by another compone
 ```astro
 ---
 import type { ComponentProps } from 'astro/types';
-import { Button } from "./Button.astro";
+import Button from "./Button.astro";
 
 type MyButtonProps = ComponentProps<typeof Button>;
 ---