Docs: make "repository structure" easier to find

[severo]

The page https://huggingface.co/docs/datasets/repository_structure explains how to create a simple repository structure without a dataset script.
It's the simplest way to create a dataset and should be easier to find, particularly on the docs' first pages.

[mariosasko]

Loading a local dataset also works the same way when data_files are not specified, so I agree we should make this info easier to discover

cc @stevhliu

[benjaminbrown038]

Is this issue open? If so, I will self assign.

[mariosasko]

@benjaminbrown038 Yes, it is. Maybe @stevhliu can give some pointers on improving this doc page's discoverability.

[stevhliu]

I think we can add a version of the Main use-case section to the Share a dataset to the Hub tutorial.

Currently, it doesn't tell you how to structure the repository; it only tells you how to create it. So adding the "main use-case" will help bridge the gap and make it easier to find. We should also add a link to the Structure your repository guide for users who want to learn about the other options.

[benjaminbrown038]

#self-assign