Assets token fix

Sorry, I think I've approved the merge request too quickly: although your changes are ok, I would like to add some others, as the current "RELEASE_ARCHIVE_URL" used in the CI pipeline does not work with authentication. From what I understand, the API URL has to be used instead.

I've also added some parsing to the assets names in fetch_files, otherwise in that case the asset is named "archive.tar.gz?sha=v0.0.2". With this fix, it is now only based on the path, removing queries, parameters, ...

TODO left:

• Update tutorials