Replace `PythonPlot` with a Julia-based plotting library in Docs

[navidcy]

E.g. CairoMakie

[milankl]

Yes, absolutely. My problem is just that I'm still more used to matplotlib + cartopy than to Makie, but I should change that. If you want to add GeoMakie, GLMakie to docs/Project.toml go ahead, then we can replace the examples one by one.

[milankl]

All Makie now