This follows the changes required for:

haskell-gargantext!366 (merged)

The rationale behind this change can be summarised by reading the commit description in one of the commits of that MR:

Previously there was no symmetry in the name of the share endpoint, which is meant to be used to generate a publicly-accessible URL to view a node, and the previously-called "unpulish" endpoint.

The problem is that now the "unpublish" name would clash with the dual of publishing a node. To avoid the problem, this commit renames the old "unpublish" endpoint to be "unshare", so that now it's clear that is the inverse operation of "share".