docs: add zephyr cloud deployment docs

[Nsttt]

Description (required)

Adds a new guide to deploy Astro sites to Zephyr Cloud.

Related issues & labels (optional)

• feat: astro integration ZephyrCloudIO/zephyr-packages#227

[netlify]

✅ Deploy Preview for astro-docs-2 ready!

Built without sensitive environment variables

Name	Link
🔨 Latest commit	ae17e48
🔍 Latest deploy log	https://app.netlify.com/projects/astro-docs-2/deploys/68ff671f9e006a000875fd33
😎 Deploy Preview	https://deploy-preview-12601--astro-docs-2.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[astrobot-houston]

Lunaria Status Overview

🌕 This pull request will trigger status changes.

Learn more

By default, every PR changing files present in the Lunaria configuration's files property will be considered and trigger status changes accordingly.

You can change this by adding one of the keywords present in the ignoreKeywords property in your Lunaria configuration file in the PR's title (ignoring all files) or by including a tracker directive in the merged commit's description.

Tracked Files

File	Note
en/guides/deploy/zephyr.mdx	Localization added, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[astrobot-houston]

Hello! Thank you for opening your first PR to Astro’s Docs! 🎉

Here’s what will happen next:

1. Our GitHub bots will run to check your changes.
   If they spot any broken links you will see some error messages on this PR.
   Don’t hesitate to ask any questions if you’re not sure what these mean!

2. In a few minutes, you’ll be able to see a preview of your changes on Netlify 🥳.

3. One or more of our maintainers will take a look and may ask you to make changes.
   We try to be responsive, but don’t worry if this takes a few days.

[sarah11918]

Thanks so much for adding this!

I've left just some tiny comments below, plus you'll need to add a line like the following to src/components/DeployGuidesNav.astro to get your icon to show up in the grid:

{ title: 'Zerops', slug: 'zerops', supports: ['ssr', 'static'] },

(Depends whether both fully-static and on-demand rendered is supported, put whichever are appropriate in the array!)

[sarah11918]

Suggested change

	For more detialed information refer to the Zephyr Cloud documentation on [Deploying with Astro](https://docs.zephyr-cloud.io/meta-frameworks/astro).
	For more detialed information refer to the [Zephyr Cloud documentation on deploying with Astro](https://docs.zephyr-cloud.io/meta-frameworks/astro).

link text should be as descriptive as possible about both the content and the location the link will take you to! "deploying with Astro" is a bit too general.

Also noting this page doesn't exist (yet)? Is this page expected, and we should wait on merging this until it's live?

[Nsttt]

Yep, waiting to merge this one to be shown on a real URL ZephyrCloudIO/zephyr-documentation#160.

Also lemme tweak this a bit to more descriptive :)