[doc] Update cubicweb-ctl page about how to run an instance
* remove mention of start/stop/restart/status commands that do not exist anymore
* briefly mention the "pyramid" and point to respective documentation page
* mention that a WSGI server should be used in production
Document: cubicweb-doc
Title: CubicWeb Documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/python-cubicweb-documentation/html/index.html
Files: /usr/share/doc/python-cubicweb-documentation/html/*