Create a new AAGI Quarto document. If the extension is not already
installed, it will be copied over to the _extensions
folder in the
current working directory. This function extends a function written by
Thomas Mock: https://github.com/jthomasmock/octavo/blob/master/R/use_quarto_ext.R
and by Spencer Schien: https://spencerschien.info/post/r_for_nonprofits/quarto_template/