Deprecated config default docs link points to C8 docs

[PHWaechtler]

Currently, the default docs URL in Optimizes ConfigurationValidator points to https://docs.camunda.io/optimize/next/self-managed/optimize-deployment/configuration/system-configuration/. We should consider whether this is still correct now that Optimize 7 docs have been moved. However, its possible that some of the referenced deprecated config locations may not exist in Optimize 7 docs. I also suspect some of the paths are no longer accurate.

Acceptance Criteria (Required on creation)

• Optimize 7 docs are linked where possible

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