Merge branch 'release-10.3.0' into btn_contrast

Author: broccolini

modules/primer-subhead/package.json

@@ -9,7 +9,7 @@
   },
   "author": "GitHub, Inc.",
   "license": "MIT",
-  "style": "index.scss",
+  "style": "build/build.css",
   "sass": "index.scss",
   "main": "build/index.js",
   "repository": "https://github.com/primer/primer/tree/master/modules/primer-subhead",