Move diagnostics to its own repository

diagnostics/diagnostics.sh

diagnostics/modules/README

diagnostics/modules/atsha.module

diagnostics/modules/certs.module

diagnostics/modules/cron.module

diagnostics/modules/disk_full.module

diagnostics/modules/dmesg.module

diagnostics/modules/dns.module

diagnostics/modules/firewall.module

diagnostics/modules/installed.module

diagnostics/modules/lshw.module

diagnostics/modules/messages.module

diagnostics/modules/module.sh

diagnostics/modules/network.module

diagnostics/modules/nikola.module

diagnostics/modules/processes.module

diagnostics/modules/services.module

diagnostics/modules/turris_webs.module

diagnostics/modules/uname.module

diagnostics/modules/updater.module