Docs: DVC Get started changes

[omesser]

A pass of changes after many complaints / ambiguities about how the get-started tutorial "flows" (or doesn't) about its length, and organization.

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1. Get started - "top funnel" changes #4460
   +0
2. Get Started - Condensing landing page #4502
   +0
3. Get Started / Data management - Make the the guide easier to understand and follow #4508
   C: start +1
   
4. Get Started - data management, minor followups, aesthetics #4522
   +0
5. Get started Metrics, Parameters, Plots edits #4519
   +0
6. separate pipelines to their own trail

[shcheklein]

Closing this as done? We can split the pipeline into a followup (if we don't have a ticket yet).