This is similar to the changes made in docker/docker.github.io#5607
(32958e7c60), but which appear
to didn't make their way into newer versions that were added.
The redoc JavaScript is a big file, and there's no need
to keep a separate copy for each version of the API.
This patch removes the copy per-version and moves the script
to a central location.
Size of the API directory:
before: 5.961.110 bytes (6 MB on disk)
after: 15.570 bytes (74 KB on disk)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>