This instead grabs a prebuild viz.js 2.x from a GH release.
Ideally we would use some more generic JS dep mechanism here (there's
some Good (tm) ones for Bazel now!), but this will do for now.
Change-Id: I58e9f67534acd2e3d08d93dc5f9a989dbbbbe3d1
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1721
Reviewed-by: radex <radex@hackerspace.pl>