Improve the workflow instructions for setting up a Chainlink node by providing Windows/Mac/Linux docker instructions

[StephenFluin]

[PatrickAlphaC]

Right now, running docker locally with docker is a bit of a headache. The docker gateway is different across platforms. It would be great if we had some tabs to show people how to run a chainlink node in docker no matter what platformt hey are working on.

[aelmanaa]

@dwightjl still relevant? There have been many changes on the page for the past year.

• Running from the source section has been added and it points to the Chainlink README. If more details are needed then we should update the Chainlink README.
• IMO, for docker install instructions, we should only point the users to the official link . Copying the install steps in our docs will force us to continuously monitor docker official installation docs (which is not ideal for maintenance)