Update docs

[macel94]

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Feature request type

enhancement

Is your feature request related to a problem? Please describe

Docs do not compare garnet to the latest Redis version and to its main "competitor", valkey.

Describe the solution you'd like

Add valkey benchmarks, update redis benchmarks to the latest version, update docs graphs.

Describe alternatives you've considered

if you are interested i could try to help with a PR

Additional context

No response

[badrishc]

We recently re-ran all our benchmarks for a research paper submission, and used Valkey (the latest Redis was very close to the latest Valkey in terms of benchmark results). Overall, the new numbers are almost the same as what we have reported last year in https://microsoft.github.io/garnet/docs/benchmarking/results-resp-bench. Once the paper is ready to be shared widely, we will add it to the website.