Updating the the doc site

[kfswain]

This PR is making some general updates to the doucmentation, trying to bring it in line with v1 state.

/kind documentation

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[ahg-g]

A couple of more things to update:

1. The API overview: https://gateway-api-inference-extension.sigs.k8s.io/concepts/api-overview/
2. The diagrams in more than one place (e.g., https://gateway-api-inference-extension.sigs.k8s.io/)

[kfswain]

/hold

Continuously pushing to use the Netlify dev build to get the mk-docs markdown flavor

[ahg-g]

Need a section on shedding semantics, that it is configured to shed for priority below zero and when the system hits saturation (and explain the current saturation algorithm)

[kfswain]

Need a section on shedding semantics, that it is configured to shed for priority below zero and when the system hits saturation (and explain the current saturation algorithm)

SGTM, was just about to add the InferenceObjective section in API types, do we think that is the right place to discuss this? It doesnt feel quite right to me there... its too hidden. I think I'll include it in a new section in Concepts name the subsection something like Priority and Capacity

[kfswain]

/unhold

[ahg-g]

/lgtm