Correct links in docs

[jlaehne]

• Add intersphinx links after HyperSpy2.0/ExSpy0.1 release (Closes #174).
• Add workflow to test doc build including links and correct links
• Adapt documentation based on HyperSpy2.0 release

Progress of the PR

• [x] Change implemented (can be split into several points),
• [x] ready for review.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (0d69777) 100.00% compared to head (53b3c40) 100.00%. Report is 2 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #203 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 12 12 Lines 554 556 +2 ========================================= + Hits 554 556 +2 ```

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