Initial commit from gatsby: (https://github.com/gatsbyjs/gatsby-starter-blog-theme.git)

content/posts/hello-world.mdx

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+---
+title: Hello World (example)
+date: 2019-04-15
+---
+
+Hello, world! This is a demo post for `gatsby-theme-blog`.
+
+Delete me, and get writing!
+
+```js:title=gatsby-config.js
+module.exports = {
+  __experimentalThemes: [
+    "gatsby-theme-blog", // highlight-line
+    "gatsby-theme-notes"
+  ]
+};
+```
+
+This is another paragraph after the code block.
+
+## This is a secondary heading
+
+```jsx
+import React from "react";
+import { ThemeProvider } from "theme-ui";
+import theme from "./theme";
+
+export default props => (
+  <ThemeProvider theme={theme}>{props.children}</ThemeProvider>
+);
+```