* fix: update broken documentation links

- Replace deprecated cosign GitHub URLs with current Sigstore docs
  - github.com/sigstore/cosign/blob/main/KEYLESS.md → docs.sigstore.dev/cosign/signing/signing_with_containers/
  - github.com/sigstore/cosign/blob/main/KMS.md → docs.sigstore.dev/cosign/key_management/overview/
  - github.com/sigstore/cosign/blob/main/KMS.md#kubernetes-secret → docs.sigstore.dev/cosign/key_management/overview/#kubernetes-secret

- Update Kyverno documentation URLs to new structure
  - kyverno.io/docs/writing-policies/ → kyverno.io/docs/policy-types/cluster-policy/
  - kyverno.io/docs/writing-policies/validate/#deny-rules → kyverno.io/docs/policy-types/cluster-policy/validate/
  - kyverno.io/docs/writing-policies/preconditions/ → kyverno.io/docs/policy-types/cluster-policy/preconditions/
  - kyverno.io/docs/writing-policies/external-data-sources/#variables-from-kubernetes-api-server-calls → kyverno.io/docs/policy-types/cluster-policy/external-data-sources/
  - kyverno.io/docs/writing-policies/generate/#data-examples → kyverno.io/docs/policy-types/cluster-policy/generate/
  - kyverno.io/docs/monitoring-kyverno-with-prometheus-metrics/ → kyverno.io/docs/monitoring/
  - kyverno.io/docs/writing-policies/variables/) → kyverno.io/docs/policy-types/cluster-policy/variables/ (fixed extra parenthesis)

Fixes #13791 - Fixed all 25 broken links found in documentation

Signed-off-by: Yugandhar Suthari <yrsuthari@gmail.com>

* fix: add missing website URLs in CLI command documentation

Signed-off-by: Yugandhar Suthari <yrsuthari@gmail.com>

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Signed-off-by: Yugandhar Suthari <yrsuthari@gmail.com>
Co-authored-by: Charles-Edouard Brétéché <charles.edouard@nirmata.com>