Slight cleanup of some of our readmes

[kfswain]

Part of #202

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[ahg-g]

Is this part of #202?

[danehans]

To provide clear separation between the Gateway implementation and the extension, est_proc.yaml should be in a separate directory, e.g. ./pkg/manifests/epp, ./pkg/manifests/inference-extension, etc. (xref)

[danehans]

Is this part of #202?

If so, please add Fixes: <Issue #>

[danehans]

Considering using kubectl apply -f config/crd/bases for consistency and some no-dev users are more likely to have kubectl installed than make.

[ahg-g]

+1, this will point to a released manifest once we release

[kfswain]

Added a second option for the user to pick

[ahg-g]

Actually, I am wondering if we can have the guide to not require cloning the repo? This significantly reduces the barrier to testing it out.

All the kubectl commands can be run against the files from github directly.

[ahg-g]

+1, this will point to a released manifest once we release

[ahg-g]

once this merges, we will have the manifests in the right places and we can update the kubectl commands to point to github directly so that we don't require cloning the repo to run the guide.

/lgtm