New "browse" UI

Also, separated out browse, ?meta, and ?module request handlers.

Fixes #82

modules/client/browse/Icons.js

@@ -0,0 +1,24 @@
+/** @jsx jsx */
+import { jsx } from '@emotion/core';
+import { GoFileDirectory, GoFile } from 'react-icons/go';
+import { FaTwitter, FaGithub } from 'react-icons/fa';
+
+function createIcon(Type, { css, ...rest }) {
+  return <Type css={{ ...css, verticalAlign: 'text-bottom' }} {...rest} />;
+}
+
+export function DirectoryIcon(props) {
+  return createIcon(GoFileDirectory, props);
+}
+
+export function CodeFileIcon(props) {
+  return createIcon(GoFile, props);
+}
+
+export function TwitterIcon(props) {
+  return createIcon(FaTwitter, props);
+}
+
+export function GitHubIcon(props) {
+  return createIcon(FaGithub, props);
+}