chore: Clean up unused files, imports, and work on getting end-to-end tests and unit tests running (#2272)

.webpack/rules/stylusToJavaScript.js

@@ -1,10 +0,0 @@
-const stylusToJavaScript = {
-  test: /\.styl$/,
-  use: [
-    { loader: 'style-loader' }, // 3. Style nodes from JS Strings
-    { loader: 'css-loader' }, // 2. CSS to CommonJS
-    { loader: 'stylus-loader' }, // 1. Stylus to CSS
-  ],
-};
-
-module.exports = stylusToJavaScript;