conversion errors on more complex example

[Analect]

Hi. I happily came across your tool, but I'm stumbling a little on my first attempt to convert what admittedly might be a more complex example at https://observablehq.com/@tashapiro/intro-observable-plot.

I ran ohq2quarto --ohq-ref @tashapiro/intro-observable-plot --output-dir ./test_ohq2quarto --verbose and this output a series of files per below.

|-- _quarto.yml
|-- big_tech_stock_prices.csv
|-- intro-observable-plot.qmd
|-- rladies\ philly.jpeg
|-- taylor_all_songs.csv
`-- tswift_pivoted.csv

When I ran quarto preview intro-observable-plot.qmd, it complained about empty {ojs} cells. ERROR: Fatal: OJS cell starting on line 327 is empty. OJS cells require at least one declaration., so I deleted circa 6 of these. It renders, but with lots of OJS Errors. It seems it is somehow not accessing the data files.

If I look at this section of the original file, it uses various data table cells and SQL cells (per the image below).

However, in the converted *.qmd file, these are somehow ignored, with just the markdown parts getting converted.

```{ojs}
md`<b>Taylor Swift Songs</b>`
```

```{ojs}
md`<b>Taylor Swift Songs - Pivoted by Feature</b><br>
Long format data set that we will use for the facetted plot example.`
```

It would be great to get this working.