Remove path

[MariagraziaAlastra]

Description :

Removing sign up / register link and functionality

Checklist :

• [ ] Back end tests (perl, scripts)
• [ ] Front end tests (js, integration)
• Browser verification
  • [ ] IE
  • [ ] Chrome
  • [ ] Firefox
  • [ ] Safari
  • [ ] Opera
• Mobile verification
  • [ ] iOS
  • [ ] Android