Use reusable workflow from hyperspy organisation for the doc workflow

[ericpre]

This would simplify the maintenance of GitHub CI.

Progress of the PR

• Use reusable workflow from hyperspy organisation for the doc workflow,
• [n/a] docstring updated (if appropriate),
• [n/a] update user guide (if appropriate),
• [n/a] added tests,
• added line to CHANGES.rst,
• ready for review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (27e949f) 91.75% compared to head (cc5dfba) 91.75%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #13   +/-   ##
=======================================
  Coverage   91.75%   91.75%           
=======================================
  Files          69       69           
  Lines        7279     7279           
=======================================
  Hits         6679     6679           
  Misses        600      600           

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