Add docs to repo (#38)

docs/src/theme/MDXComponents.js

@@ -0,0 +1,14 @@
+import React from 'react';
+// Import the original mapper
+import MDXComponents from '@theme-original/MDXComponents';
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+export default {
+    // Re-use the default mapping
+    ...MDXComponents,
+    // Map the "highlight" tag to our <Highlight /> component!
+    // `Highlight` will receive all props that were passed to `highlight` in MDX
+    tabs: Tabs,
+    tabItem: TabItem,
+};