left sidebar improvements (#368)

* left sidebar improvements

* lint

client/src/index.js

@@ -3,6 +3,7 @@
 import React from "react";
 import ReactDOM from "react-dom";
 import { Provider } from "react-redux";
+import { FocusStyleManager } from "@blueprintjs/core";
 
 import "./index.css";
 
@@ -10,6 +11,8 @@ import "./index.css";
 import App from "./components/app";
 import store from "./reducers";
 
+FocusStyleManager.onlyShowFocusOnTabs();
+
 ReactDOM.render(
   <Provider store={store}>
     <App />