docs: oas (#197)

Adds OpenAPI specification of Storefront and Admin APIs.
Updates docs project.

docs-util/helpers/test-server.js

@@ -0,0 +1,32 @@
+const path = require("path");
+const express = require("express");
+const getPort = require("get-port");
+
+const loaders = require("@medusajs/medusa/dist/loaders").default;
+
+const initialize = async () => {
+  const app = express();
+
+  const { dbConnection } = await loaders({
+    directory: path.resolve(process.cwd()),
+    expressApp: app,
+  });
+
+  const PORT = await getPort();
+
+  return {
+    db: dbConnection,
+    app,
+    port: PORT,
+  };
+};
+
+const setup = async () => {
+  const { app, port } = await initialize();
+
+  app.listen(port, (err) => {
+    process.send(port);
+  });
+};
+
+setup();