## Description: 
Confluence: HTML (not markdown) Anchor links not supported

## Steps to Reproduce:
Create a Quarto Document with an HTML anchor link

```
---
title: "5826-confluence-html-anchor-links-images-not-supported-only-markdown"
---

<img src="elephant.png"/>
<a href="elephant.png">elephant-image-link</a>

```

### Expected Result:
- As with Markdown, when publishing, assets are uploaded as attachments
- As with Markdown, when publishing, links are correctly replaced and supported
- As with Markdown, when publishing, images are correctly replaced and supported

### Actual Result:
- Assets are not uploaded as attachments
- Links are not correctly replaced and supported
- Images are not correctly replaced and supported

#### Workaround
- Use markdown links & images
allenmanning
2023-06-06T08:19:31Z
allenmanning
bug publishing-confluence html
v1.4
open
Confluence:  HTML Anchor links & Images not supported, only markdown
https://github.com/quarto-dev/quarto-cli/issues/5826