docs: update TTFB graph explainer

[SgtPooki]

• add more information about Helia variations

We could also add information about the Kubo configuration

cc @BigLep @dennis-tra @yiannisbot

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[dennis-tra]

Let's address Yiannis' comments and then it LGTM :)

[SgtPooki]

@yiannisbot or @dennis-tra this should be ready for merge

[dennis-tra]

Great, thanks @SgtPooki !