[web] Stop using config.repository()
Since commit 3914388b2d0f, this method creates a new Repository object
and thus reloads all the cubes, taking for ever.
Closes #8634417.
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/cubicweb-documentation/index.html
Files: /usr/share/doc/cubicweb-documentation/*.html