Improve CI intro docs
We should continue the work to improve the introductory CI/CD docs, especially the getting started page, and potentially the "Your first pipeline" tutorial.
The following discussion from !128450 (merged) should be addressed:
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@sselhorn started a discussion: (+4 comments) I feel like this sentence doesn't actually convey any information.
The following few sentences don't help much either.
That said, I think we should merge this MR as an MVC, hide this page down in the nav somewhere, and consider deleting or redirecting it at some point soon.