docs: add Fleek's Next.js template (#72988)

This pull request adds the Next.js template for Fleek. Users can use it
to get started using full-stack Next.js on Fleek.

This template is directly from the official Fleek community templates'
collection.

### What?

This adds to the templates references within the docs to get Fleek on
the Next.js documentation.

### Why?

Community templates of Next.js are great to help spread the word that
Next.js can be deployed anywhere.


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Co-authored-by: Delba de Oliveira <32464864+delbaoliveira@users.noreply.github.com>

docs/01-app/02-building-your-application/10-deploying/index.mdx

@@ -37,6 +37,7 @@ We have community maintained deployment examples with the following providers:
 
 - [Deno](https://github.com/nextjs/deploy-deno)
 - [DigitalOcean](https://github.com/nextjs/deploy-digitalocean)
+- [Fleek](https://github.com/fleek-tools/fleek-nextjs-boilerplate)
 - [Flightcontrol](https://github.com/nextjs/deploy-flightcontrol)
 - [Fly.io](https://github.com/nextjs/deploy-fly)
 - [GitHub Pages](https://github.com/nextjs/deploy-github-pages)