Adds dc utils and basic auth middleware

[awdem]

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[chris48s]

Being an EC2-based app, YNR does have a healthcheck endpoint.

Annoyingly the load balancer just calls / rather than a dedicated endpoint so we would need to allow that but if we deployed this as-is, we'd go into a loop of:

• bring up a new instance
• the load balancer decides it is unhealthy and shuts it down
• bring up a new instance

..and so on.

Given we are probably parking this until we actually have a staging site, maybe lets not not bogged down but I did just want to note that here.