DESCRIPTION
Each deployment should have a default hostname before a custom
domain can be assigned. Therefore, this domain must be in control of
the Librepages system (Librepages/conductor, namely)
SECURITY
base_domain must be different from the domains hosting confidential
information (authentication systems, PII data, etc.) to make use of
browser domain sandboxing safety. If Librepages deployment is open
to the public, unaudited, third-party content may be hosted in this
domain, so it is very important that this domain shouldn't be used
for critical infrastructure dealing with confidential information.