change next build references to the package.json build script (#46)

Author: james-elicx

pages/cloudflare/get-started.mdx

@@ -113,7 +113,7 @@ Add the following to the scripts field of your `package.json` file:
 "deploy:worker": "npm run build:worker && wrangler deploy"
 ```
 
-- `npm run build:worker`: Runs the [@opennextjs/cloudflare](https://www.npmjs.com/package/@opennextjs/cloudflare) adapter. This first builds your app by running `next build` behind the scenes, and then transforms the build output to a format that you can run locally using [Wrangler](https://developers.cloudflare.com/workers/wrangler/), and deploy to Cloudflare.
+- `npm run build:worker`: Runs the [@opennextjs/cloudflare](https://www.npmjs.com/package/@opennextjs/cloudflare) adapter. This first builds your app by running the `build` script in your `package.json` (Next.js apps use `next build` by default), and then transforms the build output to a format that you can run locally using [Wrangler](https://developers.cloudflare.com/workers/wrangler/), and deploy to Cloudflare. The build command used by OpenNext can be overridden with the `buildCommand` option in your OpenNext config.
 - `npm run dev:worker`: Takes the output generated by `build:worker` and runs it locally in [workerd](https://github.com/cloudflare/workerd), the open-source Workers Runtime, allowing you to run the app locally in the same environment that it will run in production. If you instead run `next dev`, your app will run in Node.js, which is a different JavaScript runtime from the Workers runtime, with differences in behavior and APIs.
 - `npm run preview:worker`: Runs `build:worker` and then `dev:worker`, allowing you to quickly preview your app running locally in the Workers runtime, via a single command.
 - `npm run deploy`: Builds your app, and then deploys it to Cloudflare

pages/cloudflare/index.mdx

@@ -66,6 +66,6 @@ We welcome both contributions and feedback!
 
 The OpenNext Cloudflare adapter works by taking the Next.js build output and transforming it, so that it can run in Cloudflare Workers.
 
-When you add [@opennextjs/cloudflare](https://www.npmjs.com/package/@opennextjs/cloudflare) as a dependency to your Next.js app, and then run `npx opennextjs-cloudflare` the adapter first builds your app by running `next build`, and then transforms the build output to a format that you can run locally using [Wrangler](https://developers.cloudflare.com/workers/wrangler/), and deploy to Cloudflare.
+When you add [@opennextjs/cloudflare](https://www.npmjs.com/package/@opennextjs/cloudflare) as a dependency to your Next.js app, and then run `npx opennextjs-cloudflare` the adapter first builds your app by running the `build` script in your `package.json`, and then transforms the build output to a format that you can run locally using [Wrangler](https://developers.cloudflare.com/workers/wrangler/), and deploy to Cloudflare.
 
 You can view the code for @opennextjs/cloudflare [here](https://github.com/opennextjs/opennextjs-cloudflare/blob/main/packages/cloudflare/src) to understand what it does under the hood.