`groups` still available for `render_points()`?

[LucaMarconato]

In the new aggregation notebook, this block of code:

ax = plt.gca()
sdata.pl.render_points(color="genes").pl.show(ax=ax)
sdata_shapes.pl.render_shapes(color="b", alpha=0.7).pl.show(ax=ax)

shows this

IIRC @timtreis you told me that groups is it part of the code from squidpy that needs to be refactored and currently doesn't work (it would be cool to use it to plot just the points of type b). Opening this issue to keep track of this.