Add subtle branding to shared documents

shared/components/OutlineLogo/index.js

@@ -0,0 +1,9 @@
+// @flow
+import * as React from 'react';
+import logo from './logo.png';
+
+function OutlineLogo() {
+  return <img src={logo} width={16} height={16} alt="Outline Logo" />;
+}
+
+export default OutlineLogo;