start: complete setup for data pipelines

[jorgeorpinel]

Per #1943

... the user needs to do few additional steps...

• run git init
• run dvc init
• fetch data/data.xml
  UPDATE: Or just checkout appropriate tag from example repo

[jorgeorpinel]

p.s. not sure this is wanted per #1943 (comment):

Doing it completely reproducible and chapters independent makes it a hands-on tutorial like (which get started is not). It means longer read time, more distractions for users who want to get the idea quick, etc.

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[jorgeorpinel]

180° turn: let's just mention the Data Versioning chapter (and corresponding example repo tag) as preparation then?

p.s. maybe the Pipelines chapter should come before Data and Model Access BTW?

[jorgeorpinel]

Note: I'm leaving this sentence out. Also, it's repetitive given "This should be a good time to commit the changes with Git" which is at the end of https://dvc.org/doc/start/data-management/data-pipelines#dependency-graphs-dag (after stage add).

[jorgeorpinel]

I guess this part is also needed? Please commit if so:

Suggested change

	repo.
	repo and using `dvc pull` to get the DVC-tracked data.

[dberenbaum]

Also, I don't believe this should be a priority. Even if we do this at best we'll get some small improvement. It's not worth it. We should be doing major updates (whatever it means).

@jorgeorpinel What do you think about closing this PR? It seems like we went into detailed review without resolving the question of whether it's worth doing at all?

Edit: Similar discussion applies to #4000

[jorgeorpinel]

If you don't approve it feel free to close it to avoid further discussion on a non-priority @dberenbaum . Otherwise, if the change can be valuable, please approve+merge (since the work has been done after all). No worries either way!

[dberenbaum]

Thanks @jorgeorpinel! Despite the narrow scope, I still think there's discussion that would be needed here about what should be added and deleted, so going to close to not distract from priorities.