User accounts on the platform should have a role for accessibility experts
Currently the platform accommodates components and users can choose for themselves to tag their components to be accessible.
This is a bit too prone for the label of "accessible" holding no value, so we should only let certain people tag components as being accessible.
For this we need a user-role for "accessibility-expert".
This role should then only be given to people that have a known record as a11y-experts.
This was one of the conclusions of a discussion with @marloes_bosch
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