Change the menu for anonymous users

As suggested by @lauriii It would be beneficial to add some better menu-items to the anonymous menu.

Currently anonymous users don't know they can register easily, so

• The link to "login", should be changed to "login / register" (this would show that creating an account is for everyone)
• Add the link "Create component" to the menu (but make it redirect to the register page?) (This would make the benefit of the platform more clear, as it's user-driven)