Update Website Listings

[cwickham]

Closes quarto-dev/quarto-cli#8303

• Add support for programmatically filtering content from a listing using include or exclude with glob syntax to include or exclude specific items from the listing. See quarto-dev/quarto-cli@d415d9ca5b7cb59a8a4750dd3eeb60116b931bd6s Already exists at https://quarto.org/docs/websites/website-listings.html#including-or-excluding-items
• (#6407): Add supporting for the field word-count for listing items. It is not displayed by default. Added entry in fields table in Guide
• (#4800): Add support for including an xml-stylesheet in listings. Use the xml-stylesheet: example.xsl under feed: to provide a path to an XSL style sheet to style your RSS feed. In reference.
• (#7290): Add support for feed:type of metadata, which will use only explicitly provided description metadata when generating an RSS feed. Additionally, note that partial feed types will prefer to use an explicit description over the first paragraph, when a description is available. Edited entry in feeds table in Guide

[github-actions]

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[dragonstyle]

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