TST: Fix assets
TST: Fix assets

Ref: https://github.com/miracle2k/webassets/issues/537

MarkusH/pelican-plugins,mikitex70/pelican-plugins,mortada/pelican-plugins,mortada/pelican-plugins,mikitex70/pelican-plugins,mikitex70/pelican-plugins,mortada/pelican-plugins,MarkusH/pelican-plugins,mortada/pelican-plugins,mortada/pelican-plugins,MarkusH/pelican-plugins,mikitex70/pelican-plugins,MarkusH/pelican-plugins,MarkusH/pelican-plugins