Hide page content until turbo:load event

To avoid cases when Turbo links are processed as normal HTTP requests

app/javascript/application.js

@@ -1,3 +1,8 @@
 // Configure your import map in config/importmap.rb. Read more: https://github.com/rails/importmap-rails
 import "@hotwired/turbo-rails"
 Turbo.session.drive = false
+
+function showPage(event) {
+  document.documentElement.style.visibility="visible";
+}
+document.addEventListener('turbo:load', showPage);