Correctly wire the tutorial up (#939)

## Description

Correctly wire the tutorial up

This also adds the tutorial to the sidebar so that the user doesn't get lost.

## Type of change

<!--- Please check the type of change your PR introduces: --->
- [x] 🗺️ Documentation

## Test Plan

<!-- How will this be tested prior to merging.-->
- [x] 💪 Manual

docs/sidebars.js

@@ -17,6 +17,7 @@ const sidebars = {
   docsSidebar: [
     'intro',
     'install',
+    'tutorial',
     {
       type: 'category',
       label: 'Initial Configuration',

docs/src/pages/index.js

@@ -16,7 +16,7 @@ function HomepageHeader() {
         <div className={styles.buttons}>
           <Link
             className="button button--secondary button--lg"
-            to="intro">
+            to="tutorial">
             Docusaurus Tutorial - 5min ⏱️
           </Link>
         </div>