Start Page
The Startpage is either a page produced via pages/index.php or via a collection template, that produces the path index.
Redirect
You could also have a very basic pages/index.php template, that does a client side redirect.
<!DOCTYPE html>
<meta
http-equiv="refresh"
content="0; URL=<?= path_page('/01-getting-started/01-getting-started') ?>"
/>
<title>you will be redirect to our start page</title>