feat: simple theme selector. only works with hardcoded light and dark for now

ui/src/routes.js

@@ -0,0 +1,7 @@
+import React from 'react'
+import { Route } from 'react-router-dom'
+import Configuration from './configuration/Configuration'
+
+export default [
+  <Route exact path="/configuration" render={() => <Configuration />} />
+]