Validation unclear on first registration page

[Cory Redmond]

Describe the bug
There is no validation when clicking the 'continue' button on the first page of registration. Meaning if no required fields are completed the user is in the dark as to why the form won't submit.

To Reproduce
Steps to reproduce the behavior:

1. Go to register
2. Click continue
3. Watch video accept terms and conditions and click 'start hacking'
4. No visible error

Expected behavior
The inability to continue on to the next page without validation of email address and ts&cs.

Additional context
https://github.com/digitalocean/hacktoberfest/blob/8b48009228ad0f1abd05d933246b4c6674e03681/app/views/users/registration.html.erb#L65
This continue button.

[Cory Redmond]

[Katy Howard]

Resolved in #607