Admin overview doc

[iRaindrop]

Write an Aministration Overview and finish up high-level remaining tasks for install docs.

Proposed Changes

• Add Administration Overview to the doc set. Summarize task areas for a Knative admin with links.

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[evankanderson]

This reads more like a table of contents than an overview, at the moment.

Looking at I'm noticing that right now it's largely an exposition of the left-hand nav (or desired left-hand nav), which doesn't feel like the best use of reading time.

If you look at https://knative.dev/docs/, it starts out with "what this document is about".

In this case, I think the document is about something like:

Knative consists of several on-cluster components alongside client tools like kn and func. This page explains how to install and manage Knative on an existing Kubernetes cluster. It assumes that you are generally familiar with Kubernetes, Kubernetes administration, the kubectl command, and have at least some familiarity with the larger CNCF ecosystem. Additionally, it assumes that you have the ability to install software and manage resources in all clusters in the namespace (cluster-admin permissions, or equivalent). When you've finished, you will understand the different Knative components, their roles, the Knative philosophy, and how to enable your cluster's users to develop using Knative.

[dwelsch-esi]

@iRaindrop, @evankanderson

Comments and suggestions added. Happy to answer questions or explain my reasoning if you have questions. Please respond in the PR.

If I contradict the style guide, go with the style guide.

[evankanderson]

Just a few more items, but I feel like we're getting close.

[evankanderson]

A few smaller corrections, a few of which I connected with you on slack because I was concerned about a longer turn-around time.

[evankanderson]

Not for this PR, but we should expand this to also talk about how application access can be managed by using ingress and Eventing features to require specific types of tokens (authentication and authorization) to deliver requests or events.

[iRaindrop]

OK to merge

[evankanderson]

/lgtm
/approve

[knative-prow]

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