configuring via package.json is sometimes confusing

[toddself]

i mean we're using a lot of stuff in addition to sheetify, but, it could be more obvious how this all fits together :). I'll try to throw together some documentation PRs this week

      [
        "sheetify/transform",
        {
          "use": [
            "sheetify-sass",
            [
              "sheetify-postcss",
              {
                "plugins": [
                  "autoprefixer"
                ]
              }
            ]
          ],
          "basedir": "."
        }
      ]
    ]