Add Neon and Koyeb to list of PaaS options in Rails deployment lesson

[DrantDumani]

Because

The Rails lesson on Deployment didn't list Koyeb and Neon as PaaS options, which are listed on the NodeJS version of the lesson

This PR

• Lists Koyeb and Neon's info as PaaS options for users.

Issue

Closes #28862

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project curriculum contributing guide
• The title of this PR follows the location of change: brief description of change format, e.g. Intro to HTML and CSS lesson: Fix link text
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If any lesson files are included in this PR, they have been previewed with the Markdown preview tool to ensure it is formatted correctly
• If any lesson files are included in this PR, they follow the Layout Style Guide

[JoshDevHub]

Thank you for adding these!

Just have a couple of requested changes. Since this is in the context of the Rails course, it doesn't make sense to point learners to the documentation around working with node/express.

[MaoShizhong]

Perhaps should also close #28491?

[DrantDumani]

My bad on just copy pasting from the node section. The links have been updated to the ruby on rails docs!

[JoshDevHub]

🚀