feat(v2): bootstrap bootstrap (heh) theme, preset, template (#2557)

* feat(v2): Add bootstrap theme structure

* chore(v2): run prettier

* chore(v2): remove unused dependencies

* feat(v2): add bootstrap preset

* feat(v2): add bootstrap template

* remove unnecessary stuff

* --

Co-authored-by: Yangshun Tay <tay.yang.shun@gmail.com>

packages/docusaurus-theme-bootstrap/src/index.js

@@ -0,0 +1,20 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+const path = require('path');
+
+module.exports = function () {
+  return {
+    name: 'docusaurus-theme-bootstrap',
+    getThemePath() {
+      return path.resolve(__dirname, './theme');
+    },
+    getClientModules() {
+      return ['bootstrap/dist/css/bootstrap.min.css'];
+    },
+  };
+};

packages/docusaurus-theme-bootstrap/src/theme/NotFound.js

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+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React from 'react';
+import Layout from '@theme/Layout';
+
+function NotFound() {
+  return (
+    <Layout title="Page Not Found">
+      <div className="container my-xl-3">
+        <div className="row">
+          <div className="col col-6 offset-3">
+            <h1>Page Not Found</h1>
+            <p>We could not find what you were looking for.</p>
+            <p>
+              Please contact the owner of the site that linked you to the
+              original URL and let them know their link is broken.
+            </p>
+          </div>
+        </div>
+      </div>
+    </Layout>
+  );
+}
+
+export default NotFound;