v4.0

[eeholmes]

• save titlepage and coverpage to tex files so user has those.
• allow coverpage to be like titlepage
• allow user to use .yml for spec that way can have

  include-files:
  - titlepage1.yml
  - titlepage2.yml
  - copyright.tex
  - dedic.tex

See this part about breaking up the metadata

https://quarto.org/docs/projects/quarto-projects.html