erp5_web: force redirection on website using a service worker

Delete the content of the cache storage (used by erp5js), unregister the service worker and force the browser to reload.
6 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed ERP5.CodingStyleTest-Master

00:49:06

passed ERP5.PerformanceTest-Master

00:26:42

failed ERP5.UnitTest-Master

01:18:24

failed ERP5.UnitTest-Master.Medusa

01:41:51

passed SlapOS.Eggs.UnitTest-Master.Python2

00:12:16

passed SlapOS.Eggs.UnitTest-Master.Python3

00:13:24