Change version shown on homepage to include tag or commit

[MartijnR]

or all of them!

version from package.json + commit (short) hash => 1.66.2-#sfd42sdafw23

This seems perfect: git describe --tags, https://git-scm.com/docs/git-describe

[MartijnR]

Problem is that this won't work when git is not used (as OC is planning)

• [x] in oc package builds, add git describe --tags output