### Bug description

When using relative urls in a quarto document, e.g. `[my link](../../doc.qmd)`, the relative url is resolved to its absolute path in the html output after rendering, e.g. `[my link](https://example.com/stuff/doc.html)`. However in the RSS feed, these relative urls are not resolved to the absolute path. 

This behavior can be seen in the quarto.org RSS feed. The [W3 RSS validator tool](https://validator.w3.org/feed/check.cgi?url=https%3A%2F%2Fquarto.org%2Fdocs%2Fblog%2Findex.xml) calls out many relative urls in the quarto.org feed.  For example, line 49:

```
description should not contain relative URL references: ../../../../docs/output-formats/html-code.html#code-linking (49 occurrences)
```

I use my RSS feed to automate email updates to my subscribers. Since relative urls in the feed are not resolved, internal links in my posts are broken in the email updates. I suppose this would also be problematic in sindication use cases like  Rbloggers or pythonBloggers.


2023-07-01T11:13:33Z
mcb00
bug
closed
RSS Feed does not resolve relative URLs
https://github.com/quarto-dev/quarto-cli/issues/6082