docs: add Docker Standalone and Docker Export examples to Deploying page (#90386)
### What?
Updates the
[Deploying](https://nextjs.org/docs/app/getting-started/deploying) page
Docker section to document the new and updated Docker examples and add
description to old ones.
### Why?
The Docker examples were added/updated in
[#87069](https://github.com/vercel/next.js/pull/87069). The Deploying
page still only listed the generic "Docker" and "Docker
Multi-Environment" templates, so the new **Docker Standalone** and
**Docker Export** examples were not discoverable from the docs.
### How?
- Add **Docker Standalone** template linking to `examples/with-docker`
(`output: "standalone"` for minimal container images).
- Add **Docker Export** template linking to
`examples/with-docker-export-output` (`output: "export"` for static HTML
in a container).
- Order templates as: Docker Standalone, Docker Export, then Docker
Multi-Environment.
---
**Related:** This PR follows up on the merged [PR
#87069](https://github.com/vercel/next.js/pull/87069) (Docker examples
for standalone and export output). It updates the docs so the Deploying
page links to those examples.
---------
Co-authored-by: Wyatt Johnson <accounts+github@wyattjoh.ca>
Co-authored-by: Joseph <joseph.chamochumbi@vercel.com>
Co-authored-by: kristiyan.velkov <kristiyan.velkov@ffw.com>
Co-authored-by: Cursor <cursoragent@cursor.com>