30 minutes is a long tiem. It's important for "rotation" hosts, because
of timing issues described in:

199a62a1 delay hosts and shutdown should not be the same for rotation hosts

... but for "justdoit" hosts, it shouldn't matter.

It seems the delay for the second rotation was changed without
changing the descriptive comment, in:

199a62a1 delay hosts and shutdown should not be the same for rotation hosts

It was also not clear which delay we were talking about here, adding
"every X" should clarify that.

Those will provide a multi-disk setup.

that is where it belongs. also clarify wtf it is

another attempt at fixing perf issues

try to diagnose what is taking so long

clarify that current lektor sites are critical

See merge request !4