uCollect was never used in Turris OS 4.0+

This CA was used by updater to verify api server with custom
certificate (dropped in Turris OS 3.9).

Also by server-uplink package to get a challenge to verification code
for router registration in project web (EUKI). This was never used in
Turris OS 4.0+

Usage of these manually copied LE intermediates certs X3 and X4 were
removed in Turris OS 3.11.8

It was used by updater to check validity of api server custom
certificate. Since Turris OS 3.9, updater use repo server with Let's
Encrypt certificate and this script (and crl.pem respectively) was not
used.

This has worked with data from previous SSH honeypot system and
mentioned feed (hpfriends.honeycloud.net) does not exists anymore anyway

This oneliner can be achieved by `git verify-commit` command since
git version 2.1

It was moved to configuration management system

It was moved to configuration management system

These custom scripts are not used for several years now and they were
replaced by more systematic backup system including all our servers.

The previous URL shows 403.

mail_notifier was moved to turris/user-notify> about an year ago