Add Enterprise Feature admonition to Emergency Access page

[mindmonk]

When Emergency Access leaves early access, restore the following admonition to docs/hub/emergency-access.md directly below the Early Access admonition (around line 13):

:::info Enterprise Feature
Visit cryptomator.org for more information about Enterprise features.
:::

Add it once the feature is generally available.

[overheadhunter]

Or rather visit cryptomator.org/whatever-subpage-contains-a-feature-comparison-table