6.4 Minor release

[ArmandPhilippot]

Description (required)

Umbrella PR for the v6.4.0 minor release. Includes:

• Document preserveBuildServerDir adapter feature #13938
• feat: docs for pluggable Markdown processors #13919

Related issues & labels (optional)

• Suggested label: minor-release

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en/guides/integrations-guide/mdx.mdx	Source changed, localizations will be marked as outdated.
en/guides/markdown-content.mdx	Source changed, localizations will be marked as outdated.
en/guides/migrate-to-astro/index.mdx	Source changed, localizations will be marked as outdated.
en/reference/adapter-reference.mdx	Source changed, localizations will be marked as outdated.
en/reference/configuration-reference.mdx	Source changed, localizations will be marked as outdated.
en/reference/content-loader-reference.mdx	Source changed, localizations will be marked as outdated.
en/reference/modules/astro-content.mdx	Source changed, localizations will be marked as outdated.
en/reference/programmatic-reference.mdx	Source changed, localizations will be marked as outdated.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.