docs: add HackMD as a CMS guide

[EastSun5566]

Hi Astro team, thanks for the great docs!

Description (required)

I’m a dev at HackMD, a collaborative Markdown workspace. I’d like to add a guide for using HackMD as a CMS with Astro.

The guide shows how to:

• Fetch publicly readable notes using the official @hackmd/api client
• Render Markdown content with markdown-it
• Generate static pages for HackMD notes

It also adds the HackMD logo and links to astro-hackmd, a minimal example demo.

Validation completed:

• Prettier
• ESLint
• Astro build
• Link check

Thanks for reviewing!

[astrobot-houston]

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File	Note
guides/cms/hackmd.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]

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[github-actions]

Preview deployment

✅ Deployment complete!

• Latest commit: dcea267
• Preview: https://feat-hackmd-cms-guide.previews.docs.astro.build
• Workflow run: View logs

[EastSun5566]

• Preview link: https://feat-hackmd-cms-guide.previews.docs.astro.build/en/guides/cms/hackmd/
• Demo repo: https://github.com/EastSun5566/astro-hackmd
• Screenshots:

[ArmandPhilippot]

Thanks @EastSun5566, and welcome to the Docs contributors! 🙌🏽

I've left a few suggestions:

• slightly optimize the logo size.
• a few notes around asides

But otherwise, this looks almost ready to me! Thank you for making sure to stay close to our writing style!

FYI, we usually expect a stub before you write a full guide, and that's why it makes a bit more time before you get a review. But, I know HackMD is a well-know service, so we can make an exception!
I prefer to state this clearly to avoid any complaints if we end up rejecting a guide from another service...

[EastSun5566]

@ArmandPhilippot Thanks for your detailed review! I’m also sorry that I didn’t read the guide and create a stub page first.

I prefer to state this clearly to avoid any complaints if we end up rejecting a guide from another service...

That’s totally fair. I appreciate you making an exception for us.

I’ve addressed all the feedback and comments. I look forward to the next steps. Thanks again!