### Bug description

When setting the `site` parameter in `website.twitter-card` in `_quarto.yml`, the @username isn't stripped out and causes a pandoc warning when rendering the site:

``` yaml
website:
  twitter-card:
    creator: "@creatorname"
    site: "@sitename"
```

```
[WARNING] Citeproc: citation sitename not found
```

This was fixed in https://github.com/quarto-dev/quarto-cli/commit/46583c653c2f5cdb8df3089f2ff1ffe9174c918b for the `twitter-card.creator` parameter, but not for `twitter-card.site`. The warning does not appear when omitting `site` in the YAML file, as expected.

I'm using macOS 12.4, R 4.2.1, Quarto 1.0.38, and RStudio 2022.07.1 Build 554

### `quarto check` Output

``` text
[✓] Checking Quarto installation......OK
      Version: 1.0.38
      Path: /Applications/quarto/bin

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

[✓] Checking Python 3 installation....OK
      Version: 3.9.13
      Path: /opt/homebrew/opt/python@3.9/bin/python3.9
      Jupyter: (None)

      Jupyter is not available in this Python installation.
      Install with python3 -m pip install jupyter

[✓] Checking R installation...........OK
      Version: 4.2.1
      Path: /Library/Frameworks/R.framework/Resources
      LibPaths:
        - /Library/Frameworks/R.framework/Versions/4.2-arm64/Resources/library
      rmarkdown: 2.14

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

### `quarto tools check` Output

``` text
[✓] Inspecting tools

Tool         Status            Installed     Latest
chromium     Not installed     ---           869685
tinytex      Not installed     ---           v2022.08
```

### Checklist

- [X] [formatted your issue](https://yihui.org/issue/#please-format-your-issue-correctly) so it is easier for us to read?
- [X] included a minimal, fully reproducible example in a single .qmd file? Please provide the whole file rather than the snippet you believe is causing the issue.
- [X] documented the quarto version you're running, by pasting the output from running `quarto check` in the "Quarto Check Output" text area?
- [X] documented the version of the quarto tools you're running, by providing the output from running `quarto tools check` in the "Quarto Tools Check Output" text area?
- [X] documented the RStudio IDE version you're running (if applicable), by providing the value displayed in the "About RStudio" main menu dialog?
- [X] documented which operating system you're running? If on Linux, please provide the specific distribution as well.
- [X] upgraded to the latest version, including your versions of R, the RStudio IDE, and relevant R packages?
dragonstyle
2022-08-05T19:54:14Z
andrewheiss
bug
v1.1
closed
Citeproc warning when using twitter-card.site
https://github.com/quarto-dev/quarto-cli/issues/1702