Basic onboading flow (#24)

* removed unused file

* [WIP] Created onboarding form

* Finished basic onboarding flow; added tests

* Improved onboarding language

lib/pinchflat_web/components/layouts/root.html.heex

@@ -4,7 +4,7 @@
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1" />
     <meta name="csrf-token" content={get_csrf_token()} />
-    <.live_title suffix=" · Phoenix Framework">
+    <.live_title>
       <%= assigns[:page_title] || "Pinchflat" %>
     </.live_title>
     <link phx-track-static rel="stylesheet" href={~p"/assets/app.css"} />