fixing guided tour page

Summary:
There was no way to continue forward from the guided-tour page, so I have linked the tutorial intro at the bottom of the page

Created from CodeHub with https://fburl.com/edit-in-codehub

Reviewed By: tyao1

Differential Revision: D45298924

fbshipit-source-id: 65d8b7a266fbceccdd73f539ce07a2ea90740f20

website/docs/guided-tour/introduction.md

@@ -38,6 +38,20 @@ Before getting started, bear in mind that we assume some level of familiarity wi
 
 </OssOnly>
 
+## On to the Tutorial
+
+<FbInternalOnly>
+
+* [Tutorial](https://www.internalfb.com/intern/staticdocs/relay/docs/tutorial/intro/)
+
+</FbInternalOnly>
+
+<OssOnly>
+
+* [Tutorial](https://relay.dev/docs/tutorial/intro/)
+
+</OssOnly>
+
 <FbCrashCourse />
 
 <DocsRating />