Setup CNAME records for reports.ooni.torproject.org and explorer.ooni.torproject.org

After discussing this with weasel it seems like it's best if we move hosting the reports of OONI on a machine that is not staticiforme, but instead use some of the hardware we have.

To do so we would need to have some CNAME records setup that point to a domain we can use to point to these servers.

The CNAME record pointers should be:

For hosting the measurements

CNAME measurements.ooni.torproject.org measurements.ooni.io

For hosting the explorer

CNAME explorer.ooni.torproject.org explorer.ooni.io

We will then proceed in getting some SSL certificates for them from letsencrypt.