Update version switcher

[ericpre]

Fix documentation version switcher.

• For release version, use the major and minor increment
• For dev version, set the version to dev
• in both case, the version, it is matched against the documentation available in hyperspy/hyperspy-doc

The json file providing the link is in the dev version and will need to updated after a minor or major release - the content of this json file could automated too with a python script generating its content when building the doc but for now, this should do!

Progress of the PR

• Fix documentation version switcher,
• [n/a] update docstring (if appropriate),
• update user 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)
• add tests,
• ready for review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (60f27ff) 80.25% compared to head (1812dd7) 80.25%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##           RELEASE_next_patch    #3291   +/-   ##
===================================================
  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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[jlaehne]

Branch is protected and I can't merge?

[ericpre]

@jlaehne, I have updated the protected branch settings, can you try now?