Update ci/cd components doc

What does this MR do and why?

Trying to explain better how a component is created. In this MR, some info got removed and this MR is readding it.

How to set up and validate locally

Doc update only.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.