Scan for broken links to external URLs

[bart-vmware]

We should run a tool that recursively follows all the links and reports which ones are broken. And then correct or remove them.

For example, there are many links pointing to docs.pivotal.io, such as https://docs.pivotal.io/spring-cloud-services/1-5/common/circuit-breaker/, which today redirects to the generic Broadcom page at https://techdocs.broadcom.com/us/en/vmware-tanzu.html.

[bart-vmware]

Remaining hard broken links after the fixes in #385 are listed in the table below.
Note this does not include soft broken links, such as the one mentioned above.

URL	Anchor Text	Linked From
https://credhub-api.cfapps.io/	CredHub API	https://steeltoe.io/docs/v3/security/credhub-api-client.html
https://docs.spring.io/spring-amqp/reference/html/	Queue Affinity and the LocalizedQueueConnectionFactory	https://steeltoe.io/docs/v3/stream/rabbit-binder.html
https://github.com/SteeltoeOSS/Samples/tree/3.x/messaging/tutorials	source code of the tutorials	https://steeltoe.io/guides/messaging/Tutorials/Tutorial1/Readme.html
https://spring.io/projects/spring-cloud/docs/1.0.3/spring-cloud.html	Spring Cloud Eureka [301 from https://projects.spring.io/spring-cloud/docs/1.0.3/spring-cloud.html]	https://steeltoe.io/docs/v4/discovery/initialize-discovery-client.html
https://start.steeltoe.io/api/config/	https://start.steeltoe.io/api/config/	https://steeltoe.io/articles/create-dotnet-microservice-projects-automatically-with-steeltoe-initializr.html
https://start.steeltoe.io/api/config/dotNetFrameworks	https://start.steeltoe.io/api/config/dotNetFrameworks	https://steeltoe.io/articles/create-dotnet-microservice-projects-automatically-with-steeltoe-initializr.html
https://steeltoe.io/api/v3/Steeltoe.Bootstrap.html	Bootstrap	https://steeltoe.io/api/v3/Steeltoe.Bootstrap.Autoconfig.HostBuilderExtensions.html
https://steeltoe.io/api/v3/Steeltoe.Extensions.html	Extensions	https://steeltoe.io/api/v3/Steeltoe.Extensions.Configuration.AbstractServiceOptions.html
https://steeltoe.io/api/v3/Steeltoe.html	Steeltoe	https://steeltoe.io/api/v3/Steeltoe.CircuitBreaker.ICircuitBreaker.html
https://steeltoe.io/api/v4/Steeltoe.Bootstrap.html	Bootstrap	https://steeltoe.io/api/v4/Steeltoe.Bootstrap.AutoConfiguration.HostApplicationBuilderExtensions.html
https://steeltoe.io/api/v4/Steeltoe.Discovery.html	Discovery	https://steeltoe.io/api/v4/Steeltoe.Discovery.HttpClients.DiscoveryHttpClientBuilderExtensions.html
https://steeltoe.io/api/v4/Steeltoe.html	Steeltoe	https://steeltoe.io/api/v4/Steeltoe.Bootstrap.AutoConfiguration.HostApplicationBuilderExtensions.html
https://steeltoe.io/api/v4/Steeltoe.Management.html	Management	https://steeltoe.io/api/v4/Steeltoe.Management.Endpoint.ActuatorRouteBuilderExtensions.html
https://steeltoe.io/api/v4/Steeltoe.Security.Authentication.html	Authentication	https://steeltoe.io/api/v4/Steeltoe.Security.Authentication.JwtBearer.JwtBearerAuthenticationBuilderExtensions.html
https://steeltoe.io/api/v4/Steeltoe.Security.html	Security	https://steeltoe.io/api/v4/Steeltoe.Security.Authentication.JwtBearer.JwtBearerAuthenticationBuilderExtensions.html
https://steeltoe.io/docs/v3/bootstrap/index.md	full table	https://steeltoe.io/articles/releases/steeltoe-3-1-minor-release-major-deal.html
https://steeltoe.io/docs/v3/configuration/config-server-provider.md	using Spring Cloud Config Server with Steeltoe	https://steeltoe.io/guides/get-to-know-steeltoe/exercise4.html
https://steeltoe.io/docs/v3/configuration/kubernetes-providers.md	Steeltoe offers a Kubernetes provider	https://steeltoe.io/articles/tech-tutorial-use-kubernetes-for-modern-net-apps-steeltoe-and-project-tye-are-your-path-to-productivity.html
https://steeltoe.io/docs/v3/connectors/microsoft-sql-server.md	have a look at the docs	https://steeltoe.io/guides/get-to-know-steeltoe/exercise3.html
https://steeltoe.io/docs/v3/connectors/usage.md	service bindings	https://steeltoe.io/guides/get-to-know-steeltoe/exercise3.html
https://steeltoe.io/docs/v3/discovery/discovering-services.md	discover services	https://steeltoe.io/guides/service-discovery/consul.html
https://steeltoe.io/docs/v3/discovery/hashicorp-consul.md	Service Discovery with Consul docs	https://steeltoe.io/guides/service-discovery/consul.html
https://steeltoe.io/docs/v3/discovery/index.md	documentation for Steeltoe Service Discovery	https://steeltoe.io/guides/service-discovery/consul.html
https://steeltoe.io/docs/v3/discovery/load-balancing.md	Customizable load-balancing	https://steeltoe.io/articles/tech-tutorial-use-kubernetes-for-modern-net-apps-steeltoe-and-project-tye-are-your-path-to-productivity.html
https://steeltoe.io/docs/v3/logging/index.md	Dynamic logging	https://steeltoe.io/articles/releases/steeltoe-3-0-packs-a-mighty-punch-with-many-new-features.html
https://steeltoe.io/docs/v3/management/health.md	health actuator endpoint	https://steeltoe.io/articles/tech-tutorial-use-kubernetes-for-modern-net-apps-steeltoe-and-project-tye-are-your-path-to-productivity.html
https://steeltoe.io/docs/v3/management/info.md	info actuator	https://steeltoe.io/guides/get-to-know-steeltoe/exercise1.html
https://steeltoe.io/docs/v3/management/loggers.md	logger actuator	https://steeltoe.io/guides/get-to-know-steeltoe/exercise1.html
https://steeltoe.io/docs/v3/management/metrics.md	metrics endpoint	https://steeltoe.io/articles/releases/steeltoe-3-0-packs-a-mighty-punch-with-many-new-features.html
https://steeltoe.io/docs/v3/management/using-endpoints.md	you should use security in production environments	https://steeltoe.io/guides/get-to-know-steeltoe/exercise2.html
https://steeltoe.io/docs/v3/messaging/index.md	Steeltoe Messaging	https://steeltoe.io/articles/releases/steeltoe-3-1-minor-release-major-deal.html
https://steeltoe.io/docs/v3/messaging/rabbitmq-intro.md	in the docs	https://steeltoe.io/articles/releases/steeltoe-3-0-packs-a-mighty-punch-with-many-new-features.html
https://steeltoe.io/docs/v3/messaging/rabbitmq-reference.md	Request/Reply Message	https://steeltoe.io/guides/messaging/Tutorials/Tutorial6/Readme.html
https://steeltoe.io/docs/v3/stream/data-flow-stream.md	Steeltoe stream docs for SCDF	https://steeltoe.io/articles/releases/steeltoe-3-1-minor-release-major-deal.html
https://steeltoe.io/docs/v3/stream/index.md	the documentation	https://steeltoe.io/articles/releases/steeltoe-3-1-minor-release-major-deal.html
https://steeltoe.io/docs/v3/tracing/index.md	read the docs	https://steeltoe.io/guides/get-to-know-steeltoe/exercise1.html
https://steeltoe.io/docs/v3/welcome/index.md	docs	https://steeltoe.io/articles/releases/steeltoe-3-0-packs-a-mighty-punch-with-many-new-features.html
https://steeltoe.io/docs/v3/welcome/whats-new.md	this page	https://steeltoe.io/articles/releases/steeltoe-3-0-packs-a-mighty-punch-with-many-new-features.html
https://steeltoe.io/guides/observability/grafana.md	observability guides	https://steeltoe.io/articles/releases/steeltoe-3-0-packs-a-mighty-punch-with-many-new-features.html
https://steeltoe.io/guides/stream/quick-start.md	quick start guide	https://steeltoe.io/articles/releases/steeltoe-3-1-minor-release-major-deal.html
https://steeltoe.io/logging	Dynamic Logging	https://steeltoe.io/
https://steeltoe.io/reference/reference-release-notes/	Steeltoe 2.2	https://steeltoe.io/articles/releases/steeltoe-2-2-gives-your--microservices-a-boost.html
https://techdocs.broadcom.com/us/en/vmware-tanzu/platform-services/tanzu-cloud-service-broker-for-gcp/1-5/csb-gcp/index.html	VMware Tanzu Cloud Service Broker for GCP	https://steeltoe.io/docs/v4/connectors/redis.html
https://techdocs.broadcom.com/us/en/vmware-tanzu/platform-services/tanzu-cloud-service-broker-for-microsoft-azure/1-2/csb-azure/index.html	Cloud Service Broker [301 from https://docs.vmware.com/en/Tanzu-Cloud-Service-Broker-for-Azure/1.2/csb-azure/GUID-index.html]	https://steeltoe.io/docs/v3/connectors/redis.html
https://techdocs.broadcom.com/us/en/vmware-tanzu/platform-services/tanzu-cloud-service-broker-for-microsoft-azure/1-9/csb-azure/index.html	VMware Tanzu Cloud Service Broker for Azure	https://steeltoe.io/docs/v4/connectors/mysql.html
https://www.wavefront.com/sign-up/	Create a 30 day trial	https://steeltoe.io/guides/observability/wavefront.html

@TimHess Can you please add redirects for the internal links, or update their sources?