[sessions] Document how to remove session data alltogether
https://cubicweb.readthedocs.io/en/default/api/pyramid/session/ explains how one can use redis to avoid storing sessions in postgresql cw_cw_cwsesssions
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Could there be a documentation or howto or code to remove handling of those sessions alltogether. This would be particularly usefull for cubicweb instances running for "public" sites where no sessions need to be stored.