This PR adds support for HTML block quotes, that also allows you to have
nested variant of it.

<img width="1441" height="804" alt="Screenshot 2025-10-08 at 10 25 57"
src="https://github.com/user-attachments/assets/4e1da766-fb54-4e87-8654-1ea14330bc97"
/>

Code example used in screenshot:

```html
<blockquote>
    <p>
        Words can be like X-rays, if you use them properly—they’ll go through
        anything. You read and you’re pierced.
    </p>
    <blockquote>
        <p>
            lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed non risus. Suspendisse lectus tortor, dignissim sit amet, adipiscing nec, ultricies sed, dolor.
        </p>
    </blockquote>
</blockquote>
```

Release Notes:

- Markdown: Added support for `HTML` block quotes