Nested lists not yet supported

```md
Here's a listing of several examples you can use to better understand idiomatic Madlib syntax and methodology.

1. The Basics
  a. Expressions
  b. Type Signatures
  c. Common Types
  d. Custom Types
  e. Keywords and Magic
    i. pipe
    ii. where
    iii. ??? 
2. Tacit Functions
3. Advanced Types
```
Nested lists should be supported