Added URL path / for site.webmanifest and pwa-service-worker because of errors in Chrome inspect console.

Thanks to xet7 !

client/00-startup.js

@@ -1,6 +1,6 @@
 // PWA
 if ('serviceWorker' in navigator) {
   window.addEventListener('load', function() {
-    navigator.serviceWorker.register('./pwa-service-worker.js');
+    navigator.serviceWorker.register('/pwa-service-worker.js');
   });
 }

client/components/main/layouts.jade

@@ -10,7 +10,7 @@ head
   link(rel="apple-touch-icon" sizes="180x180" href="apple-touch-icon.png")
   link(rel="icon" type="image/png" sizes="32x32" href="favicon-32x32.png")
   link(rel="icon" type="image/png" sizes="16x16" href="favicon-16x16.png")
-  link(rel="manifest" href="site.webmanifest")
+  link(rel="manifest" href="/site.webmanifest")
   link(rel="mask-icon" href="safari-pinned-tab.svg" color="#5bbad5")
   meta(name="apple-mobile-web-app-title" content="Wekan")
   meta(name="application-name" content="Wekan")