Feature: `FileTree` Component

[yousinix]

Currently the easiest way (excluding custom components) to visualize a directory structure is to use an ascii-based tree as follows:

your_app/
├── pubsepc.yaml
├── lib/
├── ...
└── widgetbook/
    ├── pubsepc.yaml
    ├── lib/
    └── ...

Providing first-class support for this might be a good idea, to make docs more visually appealing.
Here are some examples:

1. Nextra's FileTree - Simple and interactive file tree.
   

2. From Next.js docs - They have a more visually appealing style, they use images instead of components to be able to annotate their images.