Dvc.org: cmd ref: advanced examples for import (and get)

[jorgeorpinel]

The previous PR was too long. We're extracting this part, which is pending and hopefully the last related to dvc import and dvc get. See https://github.com/iterative/dvc.org/pull/464#pullrequestreview-259871929

• [x] Note that the import-url ref and external-dependencies guide also needs an update (See https://github.com/iterative/dvc.org/pull/464#pullrequestreview-257721375).

• [x] Create more sample repos for advanced import and possibly get command example/s. See https://github.com/iterative/dvc.org/issues/487#issuecomment-517520838 below.

• [x] Actually create/update advanced examples for import/get commands.

• Check the example-pipeline carefully. It looks like it might be broken now. (Check both examples in fact.) Moved to #564

• [x] Lets also update get started, work on use cases, etc. to incorporate these important new commands (include also dvc update).

[shcheklein]

Cool. Makes sense. Not the last though - we'll need to update get started, work on use cases, etc. :)

[jorgeorpinel]

More details/ideas on " Lets also update get started, work on use cases, etc. to incorporate these important new commands, as well as dvc update" (from this Discord thread):

"...we can create a repo that serves as a dataset registry and update get started carefully to show how that dataset can be reused" including:

• [x] The raw data file we wget in https://dvc.org/doc/get-started/add-files
• [x] To show some dataset evolution we can use images from https://dvc.org/doc/get-started/example-versioning (https://data.dvc.org/tutorial/ver/data.zip and https://data.dvc.org/tutorial/ver/new-labels.zip)
• [x] Downloads in https://dvc.org/doc/get-started/example-pipeline
• https://medium.com/@fullstackml/aab8162f8e3f (https://github.com/iterative/cnn_tutorial)?

See #564 related to some of the above, may have to address them there first.

Let's do it the same way as https://github.com/iterative/example-get-started-dev – a script that generates this registry. UPDATE: We decided to not it that way. See

[jorgeorpinel]

Note that most progress on this issue is currently being done in https://github.com/iterative/example-repos-dev/commits/master.

[shcheklein]

@jorgeorpinel let's do PRs to examples-repos-dev, just to see what's happening.

[jorgeorpinel]

let's do PRs to examples-repos-dev

OK just noticed that Ivan, will roll back and make a PR for the recent changes after https://github.com/iterative/example-repos-dev/commit/903feb7 which you reviewed.

[shcheklein]

@jorgeorpinel no need to rollback, let's just address review changes as a separate PR

[jorgeorpinel]

Started one at https://github.com/iterative/example-repos-dev/pull/6

[jorgeorpinel]

Added another example in https://github.com/iterative/dvc.org/pull/679/commits/131af1ea370592c9237f8e55a2e0202c7fe4246d as part of my current PR for a new data registry case. And will add one more example there soon.