UI should display documentations for the steps of a pipeline

[vicaire]

It would be very useful to have the documentation of a pipeline and its steps readily available in the UI.

Ideally:

• The user should be able to specify documentation using our Python library.
• The documentation would be part of the pipeline package.
• The UI would display the documentation

Example documentation needed:

• What does the step do?
• What are the parameters?
• How to make calls to the deployed server? (Cloud ML engine serving, in-cluster TF serving)
• Etc.

[yebrahim]

Agree. The static pipeline graph view seems like a good place to explain what the pipeline does.
@ajayalfred we will want to account for this in the static graph details.

[ajayalfred]

Good point. I'll make a note of design mocks needed.

[Ark-kun]

My components design has human names, description and optionally a documentation link and source link. I'm planning to add this information to the container template metadata section as annotations. Then we can use this information in the UI. https://kubernetes.io/docs/concepts/overview/working-with-objects/annotations/

[vicaire]

@Ark-kun, please get a review before proceeding with this implementation.

[vicaire]

Closing in favor of #525