fix duplicate tutorial listing in developer-spotlight/index.mdx

Basically re-apply #16319

Author: fry69

src/content/docs/developer-spotlight/index.mdx

@@ -35,8 +35,8 @@ Applications are currently open until Thursday, the 24th of October 2024. To app
 </LinkTitleCard>
 
 <LinkTitleCard
-	title="Custom access control for files in R2 using D1 and Workers"
-	href="/developer-spotlight/tutorials/custom-access-control-for-files/"
+	title="Send form submissions using Astro and Resend"
+	href="/developer-spotlight/tutorials/handle-form-submission-with-astro-resend/"
 >
 	By Cody Walsh
 </LinkTitleCard>