Three IDPs with question mark

[ewingson]

@jaxoncreed @Mitzi-Laszlo @melvincarvalho

1. https://solidtest.space/ is no longer a Solid Test Server obviously
2. https://solid.blockcasting.io/ the Server is down as on 2020-05-11
3. https://pod.celestialtech.ca/ the Server' s https is not working. The SSL-Certificate expired on 2020-01-04

I' d like to have these 3 cleared, before I make a Pull for https://dev.inrupt.net/ and https://solidweb.org/

[ewingson]

made the Pull