Documenting RabbitHole

[valentimarco]

At the moment the mkdocs/framework/cat-components/cheshire_cat/rabbit_hole.md has a TODO.
The plan is simple:

1. Add a diagram to illustrate the ingestion flow
2. Add generic customization examples to customize the ingestion flow. For specific examples, add it on mkdocs/plugins/examples.md (for example store the files in S3 buckets during ingestion and add ref in the metadata)

[pieroit]

Sounds good!

At the moment the mkdocs/framework/cat-components/cheshire_cat/mad_hatter.md has a TODO. The plan is simple:

You refer to the rabbit hole right?