task-6329: Suggest an optimized Onionoo URL
task-6329: Suggest an optimized Onionoo URL

As we are only interested in running relays, this saves 3 MB of download
according to Karsten.

gsathya/metrics-tasks,gsathya/metrics-tasks,sysrqb/metrics-tasks,gsathya/metrics-tasks,gsathya/metrics-tasks,sysrqb/metrics-tasks,sysrqb/metrics-tasks,sysrqb/metrics-tasks,sysrqb/metrics-tasks,gsathya/metrics-tasks,sysrqb/metrics-tasks,gsathya/metrics-tasks