Remove OS Security from PSA (#os-security:artemislena.eu)

Created by: ghost

Sadly, they decided to leave the community. They should be removed from the PSA space and placed in the other rooms sections.

Our logo needs to be updated. See attachment. All their rights should also be removed if they have any. If they're admin on a section or some space. They should unadmin their privileges. If lower we should remove all their privileges.

Also see #91

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