docs: oas (#197)

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

docs-util/fixture-gen/.babelrc.js

@@ -0,0 +1,13 @@
+let ignore = [`**/dist`];
+
+// Jest needs to compile this code, but generally we don't want this copied
+// to output folders
+if (process.env.NODE_ENV !== `test`) {
+  ignore.push(`**/__tests__`);
+}
+
+module.exports = {
+  sourceMaps: true,
+  presets: ["babel-preset-medusa-package"],
+  ignore,
+};