feat: use Quarto listing to create gallery

[Yunuuuu]

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[Yunuuuu]

@ShixiangWang @ZhengTiger I checked the result — it looks fine overall, but it currently uses a single file with one gallery item. The latest version of bizard divides the gallery into multiple subcategories by plot type (like violin includes Basic Violin Plot, Horizontal Violin Plot, et al). Although it’s a different structure, this approach will be beneficial in the long run: it simplifies future maintenance, removes dependencies on third-party files or example figures (instead using the generated figures as gallery images), and most importantly, enables the addition of tags or categories. For instance, under the Clinics category, we could include items like heatmap just like ggalign-gallery does (Note, the quarto gallery can also include many pages).

If this approach sounds acceptable, I'll add more commits to convert all galleries into native Quarto galleries.

[ShixiangWang]

@ZhengTiger Please check, and discuss this with @Yunuuuu , see if this is a sound and acceptable optimization.

[ZhengTiger]

For the gallery, I think it can be divided into two pages: (1) graphic types gallery page: using Quarto layout, with a representative image for each tutorial; (2) graphics gallery page: using table layout, with all graphics displayed in the table. @Yunuuuu