message: feat(docs): add Chakra exports as mdx shortcodes
  This change allows us to use any `@chakra-ui/core` export in any mdx
  file without needing to first import it.
diff: import { ChakraProvider } from "@chakra-ui/core"
  +import * as chakraComponents from "@chakra-ui/core"
  import theme from "theme"
  import { MDXProvider } from "@mdx-js/react"
  import { trackPageview } from "analytics/track-event"
  @@ -26,7 +27,7 @@ const App = ({ Component, pageProps }) => {
  </Head>
  <ChakraProvider resetCSS theme={theme} portalConfig={{ zIndex: 40 }}>
  <DefaultSeo {...siteConfig.seo} />
  - <MDXProvider components={MDXComponents}>
  + <MDXProvider components={{ ...chakraComponents, ...MDXComponents }}>
  <Component {...pageProps} />
  </MDXProvider>
  </ChakraProvider>
  