[Docs] Clarify how to get started with Pipelines in single "getting started" CI/CD page
Problem
As a user, when I am directed to documentation on getting started with Pipelines the instruction is too broad. It is an introduction to concepts rather than a walkthrough for how to get started.
Hypothesis
By creating a docs page dedicated to walking a user through how they get started with CI/CD we will increase the overall number of user that successfully begin using pipelines.
Goal
- Help namespaces setup a green pipeline as fast as possible
- Users should view this doc as a quick start guide
- Test plans will start with a simple example and then we can follow by more advanced walkthrough
- Deep link from the product to the doc