Add initial deploy static site guide for Railway

[jacksmithxyz]

Description

This PR is to convert the Railway deploy guide stub into a full guide for deploying an Astro static site on Railway, as per discussions with @sarah11918.

I've tried to keep inline with your notes and link to specific parts of the Railway docs where relevant, as opposed to saying "click here on the UI" in order to make the guide more applicable and resilient to UI changes.

This first version of the draft PR includes a single version: focusing solely on static site deployment and Railway's web UI.

I think ideally it would be good to expand this guide and/or PR to include project creation with the Railway CLI, deploying from templates, and also provide options for SSR deployment as well as static sites.

Looking forward to any feedback!

Jack

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[jacksmithxyz]

While writing this guide, Railway have deprecated Nixpacks, and set Railpack as the default builder.

This means Astro websites deployed to Railway with no adapter are automatically deployed as static sites. I have updated this guide in the latest commit to remove the unnecessary railway.json file, as setting Railpack as the default builder is no longer needed.

[sarah11918]

This looks great, @jacksmithxyz ! I appreciate the clarity and brevity!

I made a commit to just add periods to the end of all the numbered list items (it was easier than multiple suggestions), and I just have one question for you below! Looking forward to getting this updated guide merged really soon! 🙌

[sarah11918]

Since we say that Railway can also deploy on-demand rendered sites, can we have a sentence here like:

To deploy an on-demand rendered site with a server adapter to Railway...

and then whatever brief guidance we'd give? "... see the Railway SSR deploy guide."

This would just make it seem less strange to come from the main page that has both badges, but see no mention of server rendered apps.

[jacksmithxyz]

Makes complete sense to me. I'll get this updated.

[sarah11918]

Just waiting so I can check the deploy preview visually here and make sure it all looks correct, but I think we might have a winner! 😄

[sarah11918]

Let's do this thing! 🎉