Setup workflow to push development documentation automatically

[ericpre]

Progress of the PR

• push development doc automatically to https://github.com/hyperspy/hyperspy-doc on RELEASE_next_minor branch,
• workflow checked in https://github.com/hyperspy/hyperspy/actions/runs/7512929189 which committed in hyperspy/hyperspy-doc@7d99ce7,
• [n/a] update docstring (if appropriate),
• update contributor guide (if appropriate),
• add an changelog entry in the upcoming_changes folder (see upcoming_changes/README.rst),
• Check formatting changelog entry in the readthedocs doc build of this PR (link in github checks)
• [n/a] add tests,
• ready for review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (00a3e7a) 80.25% compared to head (66bb285) 80.25%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           RELEASE_next_minor    #3297   +/-   ##
===================================================
  Coverage               80.25%   80.25%           
===================================================
  Files                     147      147           
  Lines                   21859    21859           
  Branches                 5143     5143           
===================================================
  Hits                    17542    17542           
  Misses                   3111     3111           
  Partials                 1206     1206           

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