What to do about files outside the {targets} data store

[wlandau]

Prework

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Description

Currently, external input/output data files are not tracked by gittargets even if they are part of the pipeline. A workaround is for the user to move those files somewhere unobtrusive in _targets/ (not in _targets/objects/ or _targets/meta/). Should that be documented, or should it be an unofficial hack?

[wlandau]

Should add a section to the vignette recommending a _targets/user/ folder. I can document that this path is reserved in the relevant chapters of https://github.com/ropensci-books/targets and https://github.com/ropensci-books/targets-design.

[wlandau]

Should probably use the docs to recommend a specific subdirectory, e.g. _targets/user/.