feat: container API docs

[ematipico]

Description (required)

This PR adds the first batch of documentation of the container APIs.

I added a new page in the reference called "Container API" and a new paragraph in the "Testing" section.

For Astro version: 4.9. See astro PR #11051.

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 22, 2024 0:12am
docs-i18n	🔄 Building (Inspect)	Visit Preview	💬 Add feedback	May 22, 2024 0:12am

[astrobot-houston]

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Tracked Files

Locale	File	Note
en	guides/testing.mdx	Source changed, localizations will be marked as outdated.
en	reference/container-reference.mdx	Source added, will be tracked.
en	nav.ts	Source changed, localizations will be marked as outdated.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.