Issue #14, Fix online help

This commit adds documentation about the configuration options to the
online help.

Signed-off-by: Lars Kiesow <lkiesow@uos.de>
Issue #24, Fix documentation header

This will remove the configuration documentation which is part of the
more detailed online help anyway and just keeps some basic information
about this plug-in and the IRCrypt project.

Signed-off-by: Lars Kiesow <lkiesow@uos.de>