Noticed that there was a new `/var/log/18f-pages-server/pages.log` file, but
that the logs were still going to an uncompressed
`/var/log/18f-pages-server/pages.log.1`. The old `postrotate` script wasn't
actually successfully restarting the server, and a manual restart also didn't
allow the new process to write to the new log file.
Found out about the `copytruncate` directive, which will work well enough for
18F Pages, though it's not completely ideal. For more information, this issue
has a very helpful comment with a ton of technical background: