It works

Your application is running

No module has claimed the front page yet, so this is the default template's home page.

Where to go from here

Add a module. A directory under modules/Plugins/ with a module.php in it is discovered on its own. Its routes, hooks, filters, commands and schedules are declared there.
Claim this page. Declare a / route in your module, or edit templates/home.twig.
Check the wiring. php laika module:list and php laika route:list show what was discovered and what answers.