Improve Discoverability of Registration Page

[mschwrdtnr]

Describe the bug
It's not easy to find the way to register on the devday-website.
There is also no link at the "You're not registered.." message.

Expected behavior
It would be cool to have a link to the register page on the nav (if you're not logged in) and on the login page (e.g. "If you're not registered yet. Click here to register!")

[jenslauterbach]

I think there are several things to consider here:

1. Based on the design changes we probably should put a lot more focus on "actions" like creating an account and signing up for the conference (those are two separate actions). That is why I re-labeled this ticket from "bug" to "enhancement".
2. Change the wording in the form. I just noticed that we use "Anmelden" and "Registrieren" synonymous in the form (see highlighted area in the screenshot below).
3. I'd rather not use exclamation marks (at all). Shouting at our users is not a good idea 😄