Make Zinc.gut much shorter as I haven't converted everything

Signed-off-by: Damien Cassou <damien.cassou@gmail.com>
Change file extension of tex files so that Gutemberg is clearly in the process

Signed-off-by: Damien Cassou <damien.cassou@gmail.com>
Ignore more files

Signed-off-by: Damien Cassou <damien.cassou@gmail.com>
Script to download Pharo and convert Gutemberg file

Signed-off-by: Damien Cassou <damien.cassou@gmail.com>