Improve fonts

src/base/base.css

+body {
+    font-family: "Inter", sans-serif;
+}
+
+h1, h2, h3, h4, h5, h6 {
+    font-family: "Fira Sans", sans-serif;
+}

src/index.tsx

@@ -4,6 +4,10 @@ import ReactDOM from 'react-dom';
 
 import {defaults} from 'react-sweet-state';
 import {App} from "./App";
+
+import './assets/fonts/fira-sans.css';
+import './assets/fonts/inter.css';
+import './base/base.css';
 import * as serviceWorker from './serviceWorker';
 
 defaults.devtools = process.env.NODE_ENV !== "production";