cubicweb #3390018 Put the tutorials in a side repo, outside of the CubicWeb book. [rejected]

The CubicWeb book is rather a reference, hence the tutorials can be put aside and have their own life (at least, the more specialized tutorials, as the one on the data imports).

priorityimportant
typeenhancement
done in<not specified>
load0.000
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closed by<not specified>