Demo instance features

To set up a demo instance (stackspin#1397 (closed)), we need a few features:

• add a form to the login page to create an (admin) user account given an email address;
• add a warning banner to that login page and to the dashboard itself saying that this is a demo instance, and all data is essentially public, and data gets removed every night.
• make those additions conditional, so they only apply to demo.stackspin.net.

changed milestone to %2.4

added Doing label

assigned to @arie

created branch 117-demo-instance-features to address this issue

mentioned in merge request !91 (merged)

marked the checklist item add a form to the login page to create an (admin) user account given an email address; as completed

marked the checklist item make those additions conditional, so they only apply to demo.stackspin.net. as completed

added QA label and removed Doing label

mentioned in commit 1ba07346

closed with merge request !91 (merged)