initial work to make a mockup

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
The UX spec

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
dynamically load a /versions.html_fragment file so that all old versions get the complete dropdown list of versions to select

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
the build cache is too agressive, and I am regularly getting builds using an old version - forcing the issue

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Add more details so I have more of an over-view of what I need to
automate

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
avoid publishing to the root unless specified, so old version releases only goto their own dir

Docker-DCO-1.1-Signed-off-by: SvenDowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
Add "apparmor_parser" warning to check-config.sh

If AppArmor is enabled on the current system, but "apparmor_parser" isn't installed, it causes all kinds of issues.

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
pkg/units: Increased test coverage. Closes #7159.

Increased coverage:

  * Added test cases to size_test.go
  * Added coverage for duration.go

Docker-DCO-1.1-Signed-off-by: Francisco Carriedo <fcarriedo@gmail.com> (github: fcarriedo)
Add missing error check

Docker-DCO-1.1-Signed-off-by: Nathan LeClaire <nathan.leclaire@docker.com> (github: nathanleclaire)
Merge pull request #7160 from fcarriedo/7159-test-coverage

pkg/units: Increased test coverage
Merge pull request #7162 from nathanleclaire/tar-with-options-err-check

Add missing error check
pkg/units: Remove unused named returns

Remove named returns since not used in function body.  Might prevent
potential subtle bugs.

Docker-DCO-1.1-Signed-off-by: Francisco Carriedo <fcarriedo@gmail.com> (github: fcarriedo)
Initial revisions to b2d doc, new screenshots.

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

Final revisions to B2D doc.

Docker-DCO-1.1-Signed-off-by: Fred Lifton <fred.lifton@docker.com> (github: fredlf)
Merge pull request #7169 from fredlf/update_osx-install

Initial revisions to b2d doc, new screenshots.
Merge pull request #7165 from fcarriedo/remove-named-returns

pkg/units: Remove unused named returns
Merge pull request #7157 from tianon/check-config-apparmor_parser

Add "apparmor_parser" warning to check-config.sh
Merge pull request #7151 from SvenDowideit/add-version-selection-ux

Add version selection ux to the Documentation.