chore(examples): migrates form-builder example to 3.0 (#9681)

### What?

Migrates the `form-builder` example to payload `3.0`.

`Updates`:

- Now has a next app directly along side payload.

- Removes `form-builder/next-app` & `form-builder/next-pages` example
front-ends and only uses new recommended approach (i.e admin panel &
front-end on the same port - `3000`)

examples/form-builder/payload/.env.example → examples/form-builder/.env.example

@@ -1,4 +1,3 @@
-DATABASE_URI=mongodb://127.0.0.1/payload-template-blank-3-0
+DATABASE_URI=mongodb://127.0.0.1/payload-form-builder-example
 PAYLOAD_SECRET=YOUR_SECRET_HERE
-PAYLOAD_SEED=true
 NEXT_PUBLIC_PAYLOAD_URL=http://localhost:3000

examples/form-builder/.eslintrc.cjs

@@ -0,0 +1,8 @@
+module.exports = {
+  extends: 'next',
+  root: true,
+  parserOptions: {
+    project: ['./tsconfig.json'],
+    tsconfigRootDir: __dirname,
+  },
+}

examples/form-builder/README.md

@@ -0,0 +1,53 @@
+# Payload Form Builder Example
+
+The [Payload Form Builder Example](https://github.com/payloadcms/payload/tree/main/examples/form-builder/payload) demonstrates how to implement the official [Form Builder Plugin](https://payloadcms.com/docs/plugins/form-builder) in [Payload](https://github.com/payloadcms/payload).
+
+**IMPORTANT—This example includes a fully integrated Next.js App Router front-end that runs on the same server as Payload.**
+
+## Quick Start
+
+1. Clone this repo
+2. `cd` into this directory and run `pnpm i --ignore-workspace`\*, `yarn`, or `npm install`
+
+   > \*If you are running using pnpm within the Payload Monorepo, the `--ignore-workspace` flag is needed so that pnpm generates a lockfile in this example's directory despite the fact that one exists in root.
+
+3. `cp .env.example .env` to copy the example environment variables
+
+4. `pnpm dev`, `yarn dev` or `npm run dev` to start the server
+   - Press `y` when prompted to seed the database
+5. `open http://localhost:3000` to access the home page
+6. `open http://localhost:3000/admin` to access the admin panel
+   - Login with email `demo@payloadcms.com` and password `demo`
+
+That's it! Changes made in `./src` will be
+
+## How it works
+
+The [Form Builder Plugin](https://payloadcms.com/docs/plugins/form-builder) automatically adds the `forms` and `formSubmissions` collections to your config which your front-end can use to query forms and submit form data. You can embed forms into layout building blocks by referring a `forms` document in a relationship field.
+
+See the official [Form Builder Plugin](https://payloadcms.com/docs/plugins/form-builder) for full details.
+
+## Development
+
+To spin up this example locally, follow the [Quick Start](#quick-start).
+
+### Seed
+
+On boot, a seed script is included to scaffold a basic database for you to use as an example. You can remove `pnpm seed` from the `dev` script in the `package.json` to prevent this behavior. You can also freshly seed your project at any time by running `pnpm seed`. This seed creates a user with email `demo@payloadcms.com` and password `demo` along with a home page and an example page with two versions, one published and the other draft.
+
+> NOTICE: seeding the database is destructive because it drops your current database to populate a fresh one from the seed template. Only run this command if you are starting a new project or can afford to lose your current data.
+
+## Production
+
+To run Payload in production, you need to build and serve the Admin panel. To do so, follow these steps:
+
+1. Invoke the `next build` script by running `pnpm build` or `npm run build` in your project root. This creates a `.next` directory with a production-ready admin bundle.
+1. Finally run `pnpm start` or `npm run start` to run Node in production and serve Payload from the `.build` directory.
+
+### Deployment
+
+The easiest way to deploy your project is to use [Payload Cloud](https://payloadcms.com/new/import), a one-click hosting solution to deploy production-ready instances of your Payload apps directly from your GitHub repo. You can also choose to self-host your app, check out the [Deployment](https://payloadcms.com/docs/production/deployment) docs for more details.
+
+## Questions
+
+If you have any issues or questions, reach out to us on [Discord](https://discord.com/invite/payload) or start a [GitHub discussion](https://github.com/payloadcms/payload/discussions).