Add HTTPS

[smessie]

I noticed that the current online n3 editor on http://ppr.cs.dal.ca:3002/n3/editor/ has no valid TLS certificate configured.

It would be a nice addition if HTTPS could be supported.

[william-vw]

The PPR instance is a demo instance (deployed on an old server) that is, well, used for demo purposes :-) Why do you need HTTPS support?

[smessie]

I noticed that there was no HTTPS while playing around with the demo. As HTTPS nowadays is quite common and query data is sent I thought it might be useful to have a SSL certificate