Update contributed man page file names and compilation script for the eventual possibility of non-man1 man pages (hopefully a Dockerfile.5.md, for example)

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
fixed broken link to chef community site
Merge pull request #5352 from rmoriz/patch-1

Merged.
Development docs warning for beta-docs.docker.io

Update: Fix alignment issues of the "warning" block.

Docker-DCO-1.1-Signed-off-by: O.S. Tezer <ostezer@gmail.com> (github: ostezer)

Docker-DCO-1.1-Signed-off-by: O.S.Tezer <ostezer@gmail.com> (github: SvenDowideit)
make the non-release doc warning conditional and add version info

use the beta-warning area to tell the user what VERSION of docker, git
branch, and links to the official release version docs are.

requires / extends PR #5272

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #5337 from tianon/man1-assumption

Update contributed man page file names and compilation script
Merge pull request #5351 from SvenDowideit/docs-conditional-beta-warning

Docs conditional beta warning