Omit broken links (#18469)

I searched for obvious replacements using Google, but did not see any.

(I don't want to hyperlink to blog posts, as blogs don't come with any
commitment for someone to keep them current).

content/en/docs/setup/_index.md

@@ -47,7 +47,6 @@ If you're learning Kubernetes, use the Docker-based solutions: tools supported b
 |                     | [IBM Cloud Private-CE (Community Edition)](https://github.com/IBM/deploy-ibm-cloud-private) |
 |                     | [IBM Cloud Private-CE (Community Edition) on Linux Containers](https://github.com/HSBawa/icp-ce-on-linux-containers)|
 |                     | [k3s](https://k3s.io)|
-|                     | [Ubuntu on LXD](/docs/getting-started-guides/ubuntu/)|
 
 
 ## Production environment
@@ -81,8 +80,6 @@ The following production environment solutions table lists the providers and the
 | [Digital Rebar](https://provision.readthedocs.io/en/tip/README.html)            |        |  |      |     |  | ✔
 | [DigitalOcean](https://www.digitalocean.com/products/kubernetes/)        | ✔      |  |      |     |            |
 | [Docker Enterprise](https://www.docker.com/products/docker-enterprise) |       |✔  | ✔     |  |     | ✔
-| [Fedora (Multi Node)](https://kubernetes.io/docs/getting-started-guides/fedora/flannel_multi_node_cluster/)     |      |  |      | |    ✔       | ✔
-| [Fedora (Single Node)](https://kubernetes.io/docs/getting-started-guides/fedora/fedora_manual_config/)     |      |  |      | |           | ✔
 | [Gardener](https://gardener.cloud/) | ✔ | ✔ | ✔ | ✔ | ✔ | [Custom Extensions](https://github.com/gardener/gardener/blob/master/docs/extensions/overview.md) |
 | [Giant Swarm](https://www.giantswarm.io/)     | ✔       | ✔ |   ✔    |     |
 | [Google](https://cloud.google.com/)           |  [Google Kubernetes Engine (GKE)](https://cloud.google.com/kubernetes-engine/)       | [Google Compute Engine (GCE)](https://cloud.google.com/compute/)|[GKE On-Prem](https://cloud.google.com/gke-on-prem/)       |  |  |     |  |      |       |  |