docs: link Core Components to Architecture

[RafaelClovr]

Motivation

The documentation does not talk about Workflows Server and Workflow controller

Modifications

I added few basic descriptions about that components.

Verification

Just take a look at the rest of the documentation.

[terrytangyuan]

@agilgur5 Would you like to help review this?

[agilgur5]

So documentation on the internals is typically placed in an "Architecture" page in most k8s projects. Argo has an "Architecture" page in the Developer Guide.

We could link to the Architecture page from here, and that page could certainly use more details, but I don't think the architectural details belong on this page, which is part of the User Guide.
A user does not need to know the underlying architecture to get started with Argo, but they certainly may want to. I think a link to the Architecture page would serve better for that purpose

[RafaelClovr]

@agilgur5 I agree, could be interesting to just add the link.

[agilgur5]

@RafaelClovr would you like to update your PR to add a link instead?

I provided a suggestion below as to what that may look like. The Architecture page itself could use a bit more details if you would like to improve that as well.

Will have to update the title of your PR to be more specific as well, for instance, docs: link Core Components to Architecture. CI is also currently failing markdownlint

[agilgur5]

Thanks for your contribution @RafaelClovr !
If you'd like to contribute more details to the Architecture page or any other docs, feel free to make additional PRs 🙂