Use grey for outliers in visualizeEmbeddings

[zilch42]

Hi there,

It would be great if visualizeEmbeddings used grey or something like that for the -1 outlier topic so that it is distinguishable from other topics (like the visualisation functions from BERTopic do).

In this example with a few hundred topics, the outlier topic is orange, the same orange as several of the other real topics.

[drob-xx]

Yah. I'll work that in. In the meantime you know you can double click on any of the topics and they will be removed from the visualization, it's a plotly thing.