[Documentation] Missing information about CLI installation

[loganmzz]

Describe the bug

There's no documentation available about CLI installation & usage (e.g. https://docs.robusta.dev/master/setup-robusta/installation/index.html)

To Reproduce

Open https://docs.robusta.dev/master/

Expected behavior

Some pages about Robusta CLI installation

Screenshots

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Desktop (please complete the following information):

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Smartphone (please complete the following information):

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Additional context

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