include macros repo as submodule

[d-morrison]

see https://github.com/d-morrison/macros#:~:text=Or%2C%20in%20a%20shared%20_quarto.yml%20configuration%20file%3A

demo some custom macros in one of the .qmd files

[github-actions]

The GitHub issue titled "include macros" references a link to a repository or documentation about macros and suggests incorporating it into the project. The body provides a specific link to a shared _quarto.yml configuration file where the macros setup or integration is discussed. The issue seems aimed at enhancing functionality or streamlining configuration through macros. Additional context or details may be available in the linked resource.