fix: Remove centralized auth policies, change path to remaining, update docs

CHANGELOG.md

README.md

chart/Chart.yaml

...ng/istio/authorization-policies/allow-nothing-policy.yaml

...istio/authorization-policies/monitoring-authz-policy.yaml

...gbang/istio/authorizationPolicies/allow-gitlabrunner.yaml

...ang/istio/authorizationPolicies/allow-intranamespace.yaml

...izationPolicies/ingressgateway-registry-authz-policy.yaml

...ationPolicies/ingressgateway-webservice-authz-policy.yaml

...mplates/bigbang/istio/authorizationPolicies/template.yaml

docs/IstioHardened.md