Start adding mdx docs

x-pack/plugins/infra/.storybook/main.js

@@ -4,4 +4,9 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-module.exports = require('@kbn/storybook').defaultConfig;
+const defaultConfig = require('@kbn/storybook').defaultConfig;
+
+module.exports = {
+  ...defaultConfig,
+  stories: ['../**/*.stories.mdx', ...defaultConfig.stories],
+};

x-pack/plugins/infra/public/utils/use_data_search_request.stories.mdx

@@ -0,0 +1,26 @@
+import { Meta } from '@storybook/addon-docs/blocks';
+
+<Meta title="infra/dataSearch/Overview" />
+
+# The `data` plugin and `SearchStrategies`
+
+The search functionality abstraction provided by the `search` service of the
+`data` plugin is pretty powerful:
+
+- The execution of the request is delegated to a search strategy, which is
+    executed on the Kibana server side.
+- Any plugin can register custom search strategies with custom parameters and
+    response shapes.
+- Requests can be cancelled via an `AbortSignal`.
+- Partial responses can be returned as they become available if the search
+    takes longer.
+
+# Working with `data.search.search` in the Browser
+
+The following chapters describe a set of React components and hooks that aim to
+make it easy to take advantage of these characteristics from client-side React
+code.
+
+## Issuing new requests
+
+