Add baseline start point (#1)

Co-authored-by: Michael DiLeo <michael.dileo@oakstreethealth.com>
Reviewed-on: #1

public/css/postcss.config.js

@@ -0,0 +1,8 @@
+module.exports = {
+  map: false,
+  plugins: {
+    autoprefixer: {
+      cascade: false
+    }
+  }
+}