Fix manifest and icon urls, part 2.

Thanks to xet7 !

client/components/main/layouts.jade

@@ -7,10 +7,10 @@ head
     where the application is deployed with a path prefix, but it seems to be
     difficult to do that cleanly with Blaze -- at least without adding extra
     packages.
-  link(rel="shortcut icon" href="wekan-favicon.png")
-  link(rel="apple-touch-icon" href="wekan-favicon.png")
-  link(rel="mask-icon" href="wekan-150.svg")
-  link(rel="manifest" href="wekan-manifest.json")
+  link(rel="shortcut icon" href="/wekan-favicon.png")
+  link(rel="apple-touch-icon" href="/wekan-favicon.png")
+  link(rel="mask-icon" href="/wekan-150.svg")
+  link(rel="manifest" href="/wekan-manifest.json")
 
 template(name="userFormsLayout")
   section.auth-layout