D2 diagram breaks headers below

[mrpatrickpilch]

Scenario:

Default config in place as indicated in the README.

Input:

# Chapter 1

## Test
```d2
a -> b

Again

Actual Result:

![image](https://user-images.githubusercontent.com/88005594/217636528-67db246c-262f-42f4-9e5b-386489662eea.png)

My expected result would be more inline with displaying a standard code block, e.g.

Chapter 1

Test

a -> b

Again

![image](https://user-images.githubusercontent.com/88005594/217636766-e1ab9054-bc34-4c2d-8360-5971989e9d42.png)

[danieleades]

Thanks for the report! Will take a look

[danieleades]

@mrpatrickpilch do you want to try installing mdbook-d2 from main and see if that solves your problem?

something like

cargo install --git https://github.com/danieleades/mdbook-d2.git

[mrpatrickpilch]

@danieleades Looks good now! Thank you!