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/core/App.js

@@ -5,6 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+import React from 'react';
 import {renderRoutes} from 'react-router-config';
 
 import routes from '@generated/routes'; // eslint-disable-line
@@ -15,12 +16,34 @@ import docsSidebars from '@generated/docsSidebars'; // eslint-disable-line
 import pagesMetadatas from '@generated/pagesMetadatas'; // eslint-disable-line
 import siteConfig from '@generated/siteConfig'; //eslint-disable-line
 
-export default () =>
-  renderRoutes(routes, {
-    blogMetadatas,
-    docsMetadatas,
-    docsSidebars,
-    env,
-    pagesMetadatas,
-    siteConfig,
-  });
+import DocusaurusContext from '@docusaurus/context';
+
+const data = {
+  blogMetadatas,
+  docsMetadatas,
+  docsSidebars,
+  env,
+  pagesMetadatas,
+  siteConfig,
+};
+
+class App extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      setContext: context => {
+        this.setState(context);
+      },
+    };
+  }
+
+  render() {
+    return (
+      <DocusaurusContext.Provider value={{...data, ...this.state}}>
+        {renderRoutes(routes)}
+      </DocusaurusContext.Provider>
+    );
+  }
+}
+
+export default App;