Updates based on changelog

[cwickham]

Edits based on items in changelog as of 5ec7da0 06/06/24:

Website

• (#8108): Individual pages can suppress breadcrumbs using bread-crumbs: false
  Added example to: /docs/websites/website-navigation.html#breadcrumbs

Typst

• (#9293): Add toc-indent to control indentation of entries in the table of contents.

  Added example to: /docs/output-formats/typst.html#table-of-contents

Shortcodes

• (#8316): Add fallback value for the env shortcode.

  Added example to /docs/authoring/variables.html#env

quarto check

• quarto check now checks a minimal version of Typst and prints the version, to aid with troubleshooting.

  Updated example output in bug-reports.html and docs/troubleshooting/

Other Fixes and Improvements

• (#9460): $valuebox-bg-{color} Sass variables, e.g. $valuebox-bg-primary, can now be set directly for custom value box background colors.

  Added conditionally to _theme-variables.md which gets included in: docs/dashboards/theming.html#sass-variables
  Closes: Document dashboard specific SASS variables quarto-cli#9487

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