Internal links in "About" templates

Bug description

When using one of the built-in "About" templates, internal links (to pages or files) are broken and result in the message "can’t find the file at /index.html." It appears that the host url does not get properly inserted.

Steps to reproduce

Make a Quarto website using the built-in RStudio template and edit the file about.qmd to read:

---
title: "Finley Malloc"
about:
  id: hero-heading
  template: jolla
  image: profile.jpg
  links:
    - icon: twitter
      text: twitter
      href: https://twitter.com
    - icon: file-pdf
      text: broken link to index
      href: index.qmd
---

About this site

```{r}
1 + 1
```

[A link to index that does work](index.qmd)

(Or any other internal page or file in place of index.qmd).

Expected behavior

The rendered html page contains a link to the page "index.html" (or any other internal page or file).

*When using the RStudio browser the link does work, but the rendered html does not work in a browser

Actual behavior

The rendered html has a link that tries to go to the page "file:///index.html" (no host url or local location) which produces the error message "File not found".

Your environment

• IDE: RStudio Version 2024.04.2+764 (2024.04.2+764)
• MacOS 14.2.1

Quarto check output

Quarto 1.4.554
[✓] Checking versions of quarto binary dependencies...
      Pandoc version 3.1.11: OK
      Dart Sass version 1.69.5: OK
      Deno version 1.37.2: OK
[✓] Checking versions of quarto dependencies......OK
[✓] Checking Quarto installation......OK
      Version: 1.4.554
      Path: /Applications/quarto/bin

[✓] Checking tools....................OK
      TinyTeX: (external install)
      Chromium: (not installed)

[✓] Checking LaTeX....................OK
      Using: TinyTex
      Path: /Users/elissa/Library/TinyTeX/bin/universal-darwin
      Version: 2024

[✓] Checking basic markdown render....OK

[✓] Checking Python 3 installation....OK
      Version: 3.11.7
      Path: /opt/homebrew/opt/python@3.11/bin/python3.11
      Jupyter: 5.7.1
      Kernels: python3

[✓] Checking Jupyter engine render....OK

[✓] Checking R installation...........OK
      Version: 4.4.1
      Path: /Library/Frameworks/R.framework/Resources
      LibPaths:
        - /Library/Frameworks/R.framework/Versions/4.4-arm64/Resources/library
      knitr: 1.46
      rmarkdown: 2.27

[✓] Checking Knitr engine render......OK

Reproduce the issue with the built-in RStudio template by editing about.qmd and rendering the site. Inspect the generated HTML for the href produced by the template link and compare it with the working Markdown link; done means internal links from the About template resolve to the rendered page or file rather than file:///index.html.