Adding Trussworks USWDS React Wrapper (#67)

* removing unused js
* Working for first load, second raises 'failed to SSR' without DEV_SSR enabled. We will need to fix this before prod

client/gatsby-node.js

@@ -0,0 +1,16 @@
+// Disable references to window from trussworks/uswds
+// See here: https://www.gatsbyjs.com/docs/debugging-html-builds/#fixing-third-party-modules
+exports.onCreateWebpackConfig = ({ stage, loaders, actions }) => {
+    if (stage === "build-html" || stage === "develop-html") {
+      actions.setWebpackConfig({
+        module: {
+          rules: [
+            {
+              test: /@trussworks\/react-uswds/,
+              use: loaders.null(),
+            },
+          ],
+        },
+      })
+    }
+  }