Use a local copy of jquery so that the docs work in China, and offline too.

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@docker.com> (github: SvenDowideit)
Merge pull request #7894 from SvenDowideit/use-local-jquery

Use a local copy of jquery so that the docs work in China, and offline too.