[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.
[web] Stop using webconfig.vc_config()
The main issue is that this creates an entirely new Repository object
(since commit 3914388b2d0f) and thus reloads all the cubes, taking for
ever.
Related to #8634417.