Add password autofill on account login and creation

[tyiu]

@jb55 You would need to add to the existing https://damus.io/.well-known/apple-app-site-association file to include the following on the same root level as applinks

   "webcredentials": {
      "apps": [ "XK7H4JAB3D.com.jb55.damus2" ]
   },