Adding a CSS framework

This commit is not specific to building a Solid app, but it allows
us to use the Bulma CSS framework: https://bulma.io

This will allow us to use some basic styling without having to
focus on it too much - distracting from the tutorial.

package.json

@@ -7,6 +7,8 @@
     "@types/node": "12.6.6",
     "@types/react": "16.8.23",
     "@types/react-dom": "16.8.4",
+    "bulma": "^0.7.5",
+    "node-sass": "^4.12.0",
     "react": "^16.8.6",
     "react-dom": "^16.8.6",
     "react-scripts": "3.0.1",

src/App.css

-.App {
-  text-align: center;
-}
-
-.App-logo {
-  animation: App-logo-spin infinite 20s linear;
-  height: 40vmin;
-  pointer-events: none;
-}
-
-.App-header {
-  background-color: #282c34;
-  min-height: 100vh;
-  display: flex;
-  flex-direction: column;
-  align-items: center;
-  justify-content: center;
-  font-size: calc(10px + 2vmin);
-  color: white;
-}
-
-.App-link {
-  color: #61dafb;
-}
-
-@keyframes App-logo-spin {
-  from {
-    transform: rotate(0deg);
-  }
-  to {
-    transform: rotate(360deg);
-  }
-}

src/App.tsx

 import React from 'react';
-import logo from './logo.svg';
-import './App.css';
 
 const App: React.FC = () => {
   return (
     <React.StrictMode>
-      <div className="App">
-        <header className="App-header">
-          <img src={logo} className="App-logo" alt="logo" />
-          <p>
-            Edit <code>src/App.tsx</code> and save to reload.
-          </p>
-          <a
-            className="App-link"
-            href="https://reactjs.org"
-            target="_blank"
-            rel="noopener noreferrer"
-          >
-            Learn React
-          </a>
-        </header>
-      </div>
+      <p>This is a basic app that can use <a href="https://bulma.io/" title="The Bulma CSS framework">Bulma</a> for styling.</p>
     </React.StrictMode>
   );
 }

src/index.css

-body {
-  margin: 0;
-  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
-    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
-    sans-serif;
-  -webkit-font-smoothing: antialiased;
-  -moz-osx-font-smoothing: grayscale;
-}
-
-code {
-  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
-    monospace;
-}

src/index.scss

+@import "~bulma/sass/utilities/initial-variables";
+@import "~bulma/sass/utilities/functions";
+
+// You can use Bulma variables from here on
+
+
+@import "~bulma/bulma";
+@import "~bulma/sass/utilities/derived-variables";
+@import "~bulma/sass/layout/hero";
+
+// You can use derived variables from here on

src/index.tsx

 import React from 'react';
 import ReactDOM from 'react-dom';
-import './index.css';
+import './index.scss';
 import App from './App';
 import * as serviceWorker from './serviceWorker';