Restructure repository and document purpose of images
This was originally proposed by @tlater on mailing list in this thread. Please see this post and the replies on it for details.
In summary, this is the rough plan of action:
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Reorganize directory structure such that images for similar purpose live under the same sub-directory. There are three obvious categories at present:
- images for running tests
- images for running BuildStream in Docker (for end-users)
- images to be used as base systems in
.bstfiles
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Rename images based on above split.
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Update README to document the purpose of each image and expected scenarios for using it.