Fix docs

[Kirill888]

• use geopandas<1, because of country_geom #165
• move SomeCRS type alias to be after class CRS to avoid issues with type resolution in doc building when compound type is using forward references.

[codecov[bot]]

Codecov Report

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

Project coverage is 95.45%. Comparing base (457d6d5) to head (40243c4).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #168 +/- ## ======================================== Coverage 95.45% 95.45% ======================================== Files 31 31 Lines 5505 5505 ======================================== Hits 5255 5255 Misses 250 250 ```

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