[Docs] Added documentation to deploy to Railway.app

[Dhravya]

Description

Added documentation for deploying to Railway.app, a popular hosting platform for developers.

Type of change

• Documentation update

How Has This Been Tested?

Used mintlify dev command to run the docs and verify them locally.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[deshraj]

This is great. Thanks for adding this!

[zuchka]

nice work! does embedchain have a template for Railway yet?

That could make running it on Railway as easy as one-click!