refactor: Remove old react lifecycle methods (#1480)

* refactor: Remove deprecated APIs

* bump mobx-react for hooks support

* inject -> useStores
https://mobx-react.js.org/recipes-migration\#hooks-to-the-rescue

* chore: React rules of hooks lint

app/hooks/useStores.js

@@ -0,0 +1,8 @@
+// @flow
+import { MobXProviderContext } from "mobx-react";
+import * as React from "react";
+import RootStore from "stores";
+
+export default function useStores(): typeof RootStore {
+  return React.useContext(MobXProviderContext);
+}