[mdx] remove mention of layout frontmatter property

[sarah11918]

Description (required)

This removes mention of the frontmatter layout property available to MDX files from the MDX page so we can consolidate all mention of it to the Layouts page itself.

As we are not sure how much we want to promote this, leaving it to the Layouts page still makes the information prominently available without encouraging/assuming its use. Importing and using an Astro component as a layout is a more flexible option than the "magic" special property, so it will be easier to mention any limitations and caveats in just one place.

Related issues & labels (optional)

• Closes Clarify that named slots are not supported in md/mdx is layout is expressed in frontmatter #9166

While this PR itself isn't exactly what the issue asked for, I do think a few recent changes to this, the layouts and the markdown pages all combined will work together to prevent people trying to use named slots in MDX with the special frontmatter property.

[netlify]

✅ Deploy Preview for astro-docs-2 ready!

Name	Link
🔨 Latest commit	9689a06
🔍 Latest deploy log	https://app.netlify.com/sites/astro-docs-2/deploys/66f3166b1f68410008da0bd1
😎 Deploy Preview	https://deploy-preview-9474--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 site 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

Locale	File	Note
en	guides/integrations-guide/mdx.mdx	Source changed, localizations will be marked as outdated.

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.

[sarah11918]

Alright, I think I got everything worked out!

[sarah11918]

!coauthor

[github-actions]

Co-authored-by: Houston (Bot) <108291165+astrobot-houston@users.noreply.github.com>
Co-authored-by: Armand Philippot <59021693+ArmandPhilippot@users.noreply.github.com>

[ArmandPhilippot]

Sorry about earlier, I just replied quickly before logging out!

Rereading the page, I think that maybe I'm being too picky sometimes... Other examples on the page use MDX files in src/pages without a layout, so the path could have remained the same. I probably thought about importing a Layout because we were in "Using Components in MDX".

(Anyway, thanks for the update! I still think it makes more sense for newcomers... Use MDX as a page without adding a layout, you have to like minimalism! 😅)

At least the highlighting is correct now! 😄

[sarah11918]

Thanks! I'll go with this for now! Appreciate the help and attention to detail!

[sarah11918]

gah, now I want to update the rest of them...

[sarah11918]

Alright, are you up for one last check @ArmandPhilippot ???

[ArmandPhilippot]

From the source code (and from the built page), looks good to me! 🎉