Enable medium zoom for all images by default

[egoist]

Currently you can only enable this by using the Vue component: https://docute.org/builtin-components#imagezoom

We can add an option to toggle this for all images in markdown.

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[egoist]

:tada: This issue has been resolved in version 4.21.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

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