Adds the ability to create a project using an existing in the Payload
repo example through `create-payload-app`:
For example:
`pnpx create-payload-app --example custom-server` - creates a project
from the
[custom-server](https://github.com/payloadcms/payload/tree/main/examples/custom-server)
example.
This is much easier and faster then downloading the whole repo and
copying the example to another folder.
Note that we don't configure the payload config with the storage / DB
adapter there because examples can be very specific.
Changes:
- Migrates `email` example project to `3.0` from `2.0`
- Replaces `inline-css` dependency with `juice` package instead.
- Replaces `Handlebars` dependency with `ejs` package instead.
Reason for replacing packages:
- Both `inline-css` & `Handlebars` had issues with Nextjs and its
Webpack bundling i.e does not support `require.extensions`.
- `ejs` & `juice` do not rely on `require.extensions`.
