:pencil2: Edit docs to use OGC:CRS84 lon/lat instead of EPSG:4326

[weiji14]

Auditing the coordinate reference system throughout the documentation and unit tests to use longitude/latitude (OGC:CRS84) instead of latitude/longitude (EPSG:4326) whenever suitable. I.e. an axis order of x/y instead of y/x.

Preview at https://zen3geo--45.org.readthedocs.build/en/45/vector-segmentation-masks.html#load-and-reproject-image-data

References:

• https://gis.stackexchange.com/questions/54073/what-is-crs84-projection
• https://github.com/opengeospatial/geoparquet/issues/52