Add a FAQ item around the 'omni environment already exists' error

Description

If installing SIMP on PE (or an already configured server) users may encounter the following error when running simp config:

Currently, there doesn't appear to be any documentation that tells people what to do from this point in a searchable form (tried "Invalid SIMP omni-environment" and came up with nothing).

Acceptance Criteria

None
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Story Points

1