Rewrite web/gitweb, including Apache and Nginx configurations for Git/HTTP and GitWeb

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
sysadmin/debian-dev: write a tiny tutorial about how to package a Python library

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>