fix: update quick start documentation

[NotAwar]

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Fix update quick start documentation

Description

Updated documentation according to issue #782 , also added more links and split documentation into two paths development and operations. Not sure if this is what @dwelsch-esi is looking for, but hopefully it's at least close!

Related Issue

#782

Preview

• https://deploy-preview-956--etcd.netlify.app/docs/v3.5/quickstart/

Contrast with:

• https://etcd.io/docs/v3.5/quickstart/