Astro 5.13.0 release docs

[sarah11918]

Astro 5.13.0 release docs includes:

• docs(en/sitemap.mdx): describe customSitemaps #11563
• feat: experimental static import.meta.env #12105
• Add Chrome DevTools workspace flag #12108

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Tracked Files

File	Note
en/guides/integrations-guide/sitemap.mdx	Source changed, localizations will be marked as outdated.
en/reference/experimental-flags/chrome-devtools-workspace.mdx	Localization added, will be marked as complete.
en/reference/experimental-flags/raw-env-values.mdx	Source removed, will stop being tracked.
en/reference/experimental-flags/static-import-meta-env.mdx	Localization added, will be marked as complete.
fr/reference/experimental-flags/raw-env-values.mdx	Localization removed, will be marked as missing.
ko/reference/experimental-flags/raw-env-values.mdx	Localization removed, will be marked as missing.

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]

In case we need this:

Co-authored-by: Yan [email protected]
Co-authored-by: Emanuele Stoppa [email protected]
Co-authored-by: Sarah Rainsberger [email protected]
Co-authored-by: ArmandPhilippot [email protected]
Co-authored-by: bjohansebas [email protected]

[bjohansebas]

LGTM!, for the content of new experimental configuration