(docs): include guide about testing with node

Author: lmiller1990

Diff for: docs/guides/README.md

@@ -7,6 +7,7 @@
 !!!include(docs/guides/testing-single-file-components-with-jest.md)!!!
 !!!include(docs/guides/testing-single-file-components-with-mocha-webpack.md)!!!
 !!!include(docs/guides/testing-single-file-components-with-karma.md)!!!
+!!!include(docs/guides/usage-without-a-build-step-node.md)!!!
 !!!include(docs/guides/testing-async-components.md)!!!
 !!!include(docs/guides/using-with-typescript.md)!!!
 !!!include(docs/guides/using-with-vue-router.md)!!!