Move swap component into separate module

src/App.tsx

@@ -12,7 +12,7 @@ import {
   TransactionSignature,
 } from "@solana/web3.js";
 import { TokenListProvider } from "@solana/spl-token-registry";
-import Swap from "./components/Swap";
+import Swap from "./swap";
 import "./App.css";
 
 // App illustrating the use of the Swap component.

src/swap/index.ts

@@ -0,0 +1,5 @@
+// The swap module exports a single `Swap` component that can be embedded into
+// applications.
+
+import Swap from "./components/Swap";
+export default Swap;

src/swap/utils/tokens.ts

@@ -1,5 +1,5 @@
 // TODO: replace this whole file with something more modern. This is all copied
-//       from sollet..
+//       from sollet.
 
 import * as BufferLayout from "buffer-layout";
 import { BN } from "@project-serum/anchor";