[doc] Update README "Getting started" * install using pip and with pyramid in a virtualenv * link to pyramid.ini documentation * Use pyramid to start application since twisted support is gone

version=3
opts=uversionmangle=s/(rc|a|b|c)/~$1/ \
https://pypi.debian.net/cubicweb/cubicweb-(.+)\.(?:zip|tgz|tbz|txz|(?:tar\.(?:gz|bz2|xz)))