A11y: Add support for decorative images as part of content

Description

Acceptance Criteria

1. It must be possible to insert decorative images.
2. Decorative images must have a blank alt text and role presentation.

More: https://www.w3.org/WAI/tutorials/images/decorative/

Acceptance Criteria

None

Assignee

Unassigned

Reporter

Frode Petterson

Funding

None

Code reviewer

None

Released

None

Fix versions

Priority

Medium
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