Migrate from makefile to runjs

[igrybkov]

God knows how I hate Makefiles with their weird syntax and irrational behavior like any new line resets the context (workdir, for example), but commands in the same line share the context.
To get rid of makefiles, we need to migrate to another scripting platform. Runjs looks good for this role: https://github.com/pawelgalazka/tasksfile/tree/runjs