[CN-1421]: introduce client simple authentication doc

[kutluhanmetin]

No description provided.

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[amandalindsay]

Minor tweak, and a question about another. Otherwise, looks good

[hasancelik]

Custom Config should require some changes also:
https://docs.hazelcast.com/operator/latest-snapshot/custom-config

1. Security is not configurable over custom config anymore so we should mention at https://docs.hazelcast.com/operator/latest-snapshot/custom-config#security-configuration
2. Security-based sample YAMLs also should be removed or changed with another one.

[kutluhanmetin]

Custom Config should require some changes also: https://docs.hazelcast.com/operator/latest-snapshot/custom-config

1. Security is not configurable over custom config anymore so we should mention at https://docs.hazelcast.com/operator/latest-snapshot/custom-config#security-configuration
2. Security-based sample YAMLs also should be removed or changed with another one.

@hasancelik I addressed this in the commit: 6bef71a. Would you re-review please?