Feature Request

I've been using this tool a lot more as of late, and I was curious if the discussion of nesting categories has ever come about.

Using the example structure below

Collections
| -- Overview
| -- Destructuring with Cons
| -- Pattern Matching Lists
| -- Pattern Matching Arrays

I think it would be nice to be able to create nested/subcategories like so.

Collections
| -- Overview
| -- Arrays
    | -- Pattern Matching
| -- Lists
    | -- Destructuring with Cons
    | -- Pattern Matching

My initial thoughts are we could potentially do this one of two ways (I'm sure there are better ideas as well).

1. Special Character Parsing
   We could add some sort of character sequence which would be parsable for category so we know how to nest the folder appropriately.

---
category: Collections -> Lists
---

2. Additional Metadata
   We could add an additional tag such as parentCategory which tells us how to nest the folder appropriately.

---
category: Lists
parentCategory: Collections
---

Notes

• If this is a desired feature, I would be willing to assist/work on this.
• If this would come to pass, I can see people requesting the ability for the UI categories to be collapsible. I would imagine we'd want a way for the user to decide if they wanted the categories opened or closed on startup.