Improves readability of the log files.

* The new official homepage is https://sciteco.fmsbw.de/
* My new contact address is rhaberkorn AT fmsbw.de.
* The scintilla-mirror is now also on https://git.fmsbw.de/scintilla-mirror/
* Added CI script for my server on fmsbw.de that builds
  the website.
  It's run in a FreeBSD container, but does not currently
  distribute FreeBSD binaries.

* Gtk 3.24 has been introduced accidentally in 9e3746a4
  due to GtkEventControllerScroll.
* It would be possible to still support v3.12 by partially
  reversing 9e3746a4 and conditionally including teco_interface_scroll_cb().
  But it's probably not worth the trouble.

This is actually important, so that dh-exec gets used.

Scintilla v5.5.7 officially requires at least GCC v9, but if it's
only the charconv header that's required from newer releases, v8.1
will probably do as well. We assume so until proven wrong.

* They have a newer version in pkgsrc, but it's not even available
  as a binary package on the arm6.
* Has some glitches, e.g. does accept the ASCII 27 in tutorial.ms,
  but it's probably not worth to work around.

In case there is a failure, there is no way to inspect the
testsuite directory - all there will be is a CI or Launchpad runner log,
so all information should be in that log.
The CI `make check` and RPM spec also sets the --verbose flag.