www/iocaine: Install configuration files as sample

So that there is no possibility of losing your configurations.

While here, also remove the .orig file.

PR: 296506
Reported by: Kamigishi Rei <spambox@haruhiism.net>
Approved by: Sebastian Oswald <sko@rostwald.de> (maintainer)
Approved by: osa, vvd (Mentors, implicit)
MFH: 2026Q3

(cherry picked from commit 0f8691c17b7fe9d9788145516d463b27e83ae651)