Add BBR docs, example deployment

[srampal]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes ##711

Does this PR introduce a user-facing change?:

NONE

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[ahg-g]

/ok-to-test

Thanks for starting this, any planned progress on it?

[srampal]

/ok-to-test

Thanks for starting this, any planned progress on it?

Yes, I am working on it based on the v1.0.0 release that just came out. There are already some doc updates on BBR added and I will add some more in the next few days.

[srampal]

@ahg-g @kfswain this is ready for review now. I could add some more (such as using BBR to directly route to a standalone LLM service as the BackendRef instead of to an InferencePool/EPP) but maybe those and other potential scenarios could be added in a followup PR to let this one get merged for now. cc @keithmattix @davidbreitgand

[ahg-g]

/lgtm
/approve

Thanks!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahg-g, srampal

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[kfswain]

/lgtm