Improving documentation for GeometryBasics.jl

[ehehela]

When I was learning Makie.jl, I found that it largely relies on GeometryBasics.jl. However, The current document (https://juliageometry.github.io/GeometryBasics.jl/stable/) could be more user-friendly. Navigating through the documentation has been challenging, as some pages, such as rectangles, polygons, meshes, appear to be blank or nearly blank. Additionally, the lack of tutorials makes it difficult for users to become familiar with both GeometryBasics.jl and Makie.jl.

I think the GeometryBasics.jl is a powerful tool package, since many other packages rely on it. However, the inadequate documentation is hindering new users from learning. I believe that more comprehensive content and tutorials would greatly enhance the learning experience for newcomers.