[DOCS] Structure component gallery per type

[davidberenstein1957]

Which page or section is this issue related to?

https://distilabel.argilla.io/latest/components-gallery/steps https://distilabel.argilla.io/latest/components-gallery/tasks https://distilabel.argilla.io/latest/components-gallery/llms (perhaps not needed)

What are you documenting, or what change are you making in the documentation?

I think it would be nice to provide some structure to the gallery overview. For example, I think it would already be useful to showcase Tasks for generating, rewriting, scoring, judging and perhaps some other sub-categories to avoid looking through a long list of arbitrary names (EvolInstruct might not be clear to the arbitrary layman) and at least have some structre? I can image there might be surveys on synthetic data that provide a good outline for this structure.