docs: move gendocs tool to dagger/dagger

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

tools/gendocs/src/@rocketseat/gatsby-theme-docs/components/Sidebar/ExternalLink/index.js

@@ -0,0 +1,19 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { FiExternalLink } from 'react-icons/fi';
+
+export default function ExternalLink({ link, label }) {
+  return (
+    <a href={link} rel="noopener noreferrer">
+      {label}
+      <FiExternalLink
+        style={{ width: '16px', height: '16px', marginLeft: '10px' }}
+      />
+    </a>
+  );
+}
+
+ExternalLink.propTypes = {
+  link: PropTypes.string.isRequired,
+  label: PropTypes.string.isRequired,
+};