- Makefile command to build dashboard
- small refactors and simplifications of bigsky env var and CLI arg
parsing; should be safe to merge and deploy to prod
- disable some Relay features by default when bigsky is run (like
"aggregations" and "spidering")

The helper bash scripts are a bit duplicate with `gosky` commands, and
aren't super important, I can yank those if they seem too redundant.