Updating tier badge format

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doc/ci/caching/index.md

doc/ci/chatops/index.md

doc/ci/ci_cd_for_external_repos/bitbucket_integration.md

doc/ci/ci_cd_for_external_repos/github_integration.md

doc/ci/ci_cd_for_external_repos/index.md

doc/ci/cloud_deployment/ecs/deploy_to_aws_ecs.md

doc/ci/cloud_deployment/index.md

doc/ci/cloud_services/aws/index.md

doc/ci/cloud_services/azure/index.md

doc/ci/cloud_services/google_cloud/index.md

doc/ci/cloud_services/index.md

doc/ci/debugging.md

doc/ci/directed_acyclic_graph/index.md

doc/ci/docker/index.md

doc/ci/docker/using_docker_build.md

doc/ci/docker/using_docker_images.md

doc/ci/docker/using_kaniko.md

doc/ci/environments/deployment_approvals.md

doc/ci/environments/deployment_safety.md