Clarify supported Kubernetes clusters in quick-start prerequisites

[Copilot]

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Description

The quick-start prerequisites stated "Any Kubernetes cluster will work including AKS and EKS" which conflicts with the operations guide listing only AKS, EKS, k3d, and kind as tested/supported clusters.

Changes:

• Updated prerequisites to explicitly list supported clusters: AKS, EKS, k3d, and kind
• Added documentation links for all supported clusters and a link to the detailed supported clusters documentation
• Removed misleading "any cluster will work" language
• Used HTML anchor tags for links to maintain consistency with documentation style

Before:

Any Kubernetes cluster will work including AKS and EKS. However, since this is a quick start, 
running a Kubernetes cluster on your workstation with k3d or kind is recommended.

After:

Radius supports AKS, EKS, k3d, and kind clusters. For this quick start, running a Kubernetes 
cluster on your workstation with k3d or kind is recommended.

Screenshot:

Original prompt

On index.md:19-19, This prerequisites says "Any Kubernetes cluster will work including AKS and EKS." - however, https://docs.radapp.io/guides/operations/kubernetes/overview/ has a list of supported clusters which are the only ones actually supported. Should the prerequisites be rephrased? If so, what should it say?

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[kachawla]

@copilot

Suggested change

For this quick start, you will only need a **Kubernetes cluster**. To install Radius your user must have the cluster-admin role. Radius supports [AKS](https://azure.microsoft.com/en-us/products/kubernetes-service), [EKS](https://aws.amazon.com/eks/), [k3d](https://k3d.io/), and [kind](https://kind.sigs.k8s.io/) clusters. For this quick start, running a Kubernetes cluster on your workstation with k3d or kind is recommended.

For this quick start, you will only need a **Kubernetes cluster**. To install Radius your user must have the cluster-admin role. Radius [supports](https://docs.radapp.io/guides/operations/kubernetes/overview/#supported-kubernetes-clusters) [AKS](https://azure.microsoft.com/en-us/products/kubernetes-service), [EKS](https://aws.amazon.com/eks/), [k3d](https://k3d.io/), and [kind](https://kind.sigs.k8s.io/) clusters. For this quick start, running a Kubernetes cluster on your workstation with k3d or kind is recommended.

[Copilot]

Applied in commit 28fb553. The markdown links have been converted to HTML anchor tags for consistency.

[zachcasper]

Why are we limiting supported Kubernetes to only AKS, EKS, k3d, and kind? Here we say that Radius supports "Kubernetes version 1.23.8 or higher". 1.23 came out in June 2022 so almost every Kubernetes cluster should be supported.

[kachawla]

Why are we limiting supported Kubernetes to only AKS, EKS, k3d, and kind? Here we say that Radius supports "Kubernetes version 1.23.8 or higher". 1.23 came out in June 2022 so almost every Kubernetes cluster should be supported.

Radius can be installed pretty much anywhere, but we don’t have first-class support everywhere yet. For example, federated identity integration isn’t there on GKE today. I don’t have a strong preference on wording, just want us to be consistent across the docs. The link I added in this PR (https://docs.radapp.io/guides/operations/kubernetes/overview/#supported-kubernetes-clusters) differs from the overview page, so feel free to tweak whichever one makes the most sense.

[kachawla]

Why are we limiting supported Kubernetes to only AKS, EKS, k3d, and kind? Here we say that Radius supports "Kubernetes version 1.23.8 or higher". 1.23 came out in June 2022 so almost every Kubernetes cluster should be supported.

Radius can be installed pretty much anywhere, but we don’t have first-class support everywhere yet. For example, federated identity integration isn’t there on GKE today. I don’t have a strong preference on wording, just want us to be consistent across the docs. The link I added in this PR (https://docs.radapp.io/guides/operations/kubernetes/overview/#supported-kubernetes-clusters) differs from the overview page, so feel free to tweak whichever one makes the most sense.

@zachcasper thoughts?