Add Appwrite Sites to supported adapters (#85830)

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### What?

Added Appwrite Sites to the list of deployment adapters in the deploying
documentation.

### Why?

Appwrite Sites is a deployment platform that uses an adapter to run
Next.js applications on their infrastructure, similar to other platforms
listed in the Adapters section (Cloudflare, Netlify, AWS Amplify, etc.).
This addition helps developers discover Appwrite Sites as a deployment
option for their Next.js applications.

### How?

Added a link to Appwrite Sites documentation
(https://appwrite.io/docs/products/sites/quick-start/nextjs in the
Adapters section of 17-deploying.mdx

Closes NEXT-
Fixes #

-->

### What?

Added Appwrite Sites to the list of deployment adapters in the deploying
documentation.

### Why?

Appwrite Sites is a deployment platform that uses an adapter to run
Next.js applications on their infrastructure, similar to other platforms
listed in the Adapters section (Cloudflare, Netlify, AWS Amplify, etc.).
This addition helps developers discover Appwrite Sites as a deployment
option for their Next.js applications.

### How?

Added a link to Appwrite Sites documentation
(https://appwrite.io/docs/products/sites/quick-start/nextjs in the
Adapters section of 17-deploying.mdx

Author: tessamero

docs/01-app/01-getting-started/17-deploying.mdx

@@ -72,6 +72,7 @@ Next.js can be adapted to run on different platforms to support their infrastruc
 
 Refer to each provider's documentation for information on supported Next.js features:
 
+- [Appwrite Sites](https://appwrite.io/docs/products/sites/quick-start/nextjs)
 - [AWS Amplify Hosting](https://docs.amplify.aws/nextjs/start/quickstart/nextjs-app-router-client-components)
 - [Cloudflare](https://developers.cloudflare.com/workers/frameworks/framework-guides/nextjs)
 - [Deno Deploy](https://docs.deno.com/examples/next_tutorial)