feat(v2): rewrite docs loading strategy (#1092)

* feat(v2): rewrite docs loading strategy

* Prettify

* Lint

* Allow resolving from library root

* minor changes, refactor

* copyright header

v2/lib/theme/DocBody/index.js

@@ -0,0 +1,37 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+import React, {useContext, useEffect} from 'react';
+
+import DocsPaginator from '@theme/DocsPaginator'; // eslint-disable-line
+import DocusaurusContext from '@docusaurus/context';
+
+import styles from './styles.module.css';
+
+function DocBody(props) {
+  const {children, metadata} = props;
+  const context = useContext(DocusaurusContext);
+  useEffect(() => {
+    context.setContext({
+      metadata,
+    });
+  }, []);
+
+  return (
+    <div>
+      <div className={styles.docContent}>
+        <h1>{metadata.title}</h1>
+        {children}
+      </div>
+      <div className={styles.paginatorContainer}>
+        <DocsPaginator />
+      </div>
+    </div>
+  );
+}
+
+export default DocBody;