registry/endpoint: make it testable

Signed-off-by: Vincent Batts <vbatts@redhat.com>
archive: preserve hardlinks in Tar and Untar

* integration test for preserving hardlinks

Signed-off-by: Vincent Batts <vbatts@redhat.com>
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
archive: example app for diffing directories

By default is a demo of file differences, but can be used to create a
tar of changes between an old and new path.

Signed-off-by: Vincent Batts <vbatts@redhat.com>
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
archive: cleanup and more information

Signed-off-by: Vincent Batts <vbatts@redhat.com>
Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>
Merge pull request #8046 from vbatts/vbatts-archive_preserve_hard_links

archive: preserve hardlinks in Tar and Untar
Merge pull request #8387 from vbatts/vbatts-registry_test_enpoint

registry/endpoint: make it testable
Adds new Docs Style Guide.

Includes changes to mkdocs yml and removes style info from docs Read Me, adding a link instead.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)

Conflicts:
	docs/README.md

Revisions to style guide based on review.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)

More Style Guide revisions based on review.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)

A few more style guide copy edits

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
Merge pull request #8500 from fredlf/style-guide

Adds new Docs Style Guide.