Configure site URL.

def configure_url(url):
    """Configure site URL."""
    app.config['COIL_URL'] = \
        _site.config['SITE_URL'] = _site.config['BASE_URL'] =\
        _site.GLOBAL_CONTEXT['blog_url'] =\
        site.config['SITE_URL'] = site.config['BASE_URL'] =\
        url