Make https://tpo.pages.torproject.net/ open index.html pages in artifacts
For the translation previews I would need that when you are for example in https://tpo.pages.torproject.net/-/translation/-/jobs/55254/artifacts/public/index.html, if you click on a link that brings you to https://tpo.pages.torproject.net/-/translation/-/jobs/55254/artifacts/public/es/ or anything finishing with / , the webserver opens the index.html page that is under that directory.
At the moments it gives a 404.
This way translators could browse easily the website previews from https://gitlab.torproject.org/tpo/translation/-/environments and the new post-jenkins localization staging setup will be done.