[web] Do not try to rmtree symlinks in rmtreecontent()
There is a symlink in data directory (created by generate_static_dir() method)
and trying to rmtree() it will fail with an OSError. So we unlink() it
instead.
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/*