NBS data have disappeared from the web site
Description
Probably as a consequence of #463 (closed), data for NBS aren't available on the web site anymore. If solving #463 (closed) is difficult, at the minimum, we should display the last data that we were able to download and make sure that failure of the NBS fetcher doesn't erase data already downloaded
Tasks
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restore previous revision of data (manually, using Git) -
find out why the data disappeared, and if it's the downloader or NBS CI, fix it so that it does not occur anymore (just avoid the deletion, don't fix data dowload itself)