chore(docs): attempt to fix netlify build

See https://answers.netlify.com/t/gatsby-build-failed-globalthis-is-not-defined/33763 for details.

Author: mpeyper

package.json

@@ -40,8 +40,8 @@
     "lint": "kcd-scripts lint",
     "format": "kcd-scripts format",
     "coverage": "codecov",
-    "docs:dev": "npm install --no-save @emotion/core@^10.0.0 && docz dev",
-    "docs:build": "npm install --no-save @emotion/core@^10.0.0 && docz build",
+    "docs:dev": "npm install --no-save @emotion/core@^10 && docz dev",
+    "docs:build": "npm install --no-save @emotion/core@^10 gatsby@^2 && docz build",
     "contributors:add": "all-contributors add",
     "install:react": "npm install --no-save react@${REACT_VERSION:-latest} react-dom@${REACT_VERSION:-latest} react-test-renderer@${REACT_VERSION:-latest}",
     "install:react-16.9.0": "cross-env REACT_VERSION=16.9.0 npm run install:react",