Restructure routes, add tests and make pathmap dynamic

pages/[roadmap]/[version].js

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+import Roadmap from './index';
+
+export default Roadmap;

pages/[roadmap]/index.js

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+import Error from 'next/error';
+import DefaultLayout from 'layouts/default';
+import PageHeader from 'components/page-header';
+import PageFooter from 'components/page-footer';
+import RoadmapSummary from 'components/roadmap-summary';
+import { serverOnlyProps } from 'lib/server';
+import { getRequestedRoadmap } from 'lib/roadmap';
+
+const Roadmap = ({ roadmap }) => {
+  if (!roadmap) {
+    return <Error statusCode={ 404 } />
+  }
+
+  return (
+    <DefaultLayout>
+      <PageHeader />
+      <RoadmapSummary roadmap={ roadmap } />
+      <PageFooter />
+    </DefaultLayout>
+  );
+};
+
+Roadmap.getInitialProps = serverOnlyProps(({ req }) => {
+  return {
+    roadmap: getRequestedRoadmap(req),
+  };
+});
+
+export default Roadmap;