Format inheritance and avoiding conflicting format outputs

[cynthiahqy]

Ran into the folliwng error when trying to render 13a19e8

ERROR: NotFound: No such file or directory (os error 2): 

Due to multiple top-level html formats specified in _quarto.yml -- without different output file paths:

monash-learnr-modules/_quarto.yml

Lines 35 to 43 in 9da910f

	format:
	lesson-html:
	theme:
	- default
	- styles/main.scss
	html:
	theme:
	- default
	- styles/main.scss

Ideal fix would be to put a shared metadata config in modules/, but _metadata.yml is not inherited by .qmd files in subdirectories.

Workaround is to make every page in the website a lesson-html format, and then specify html formats for the top level about.qmd, index.qmd etc. pages.

[cynthiahqy]

Putting lesson options in a shared metadata file at the project level/in the modules folder also doesn't work because metadata-includes: takes absolute system paths (not relative to project paths) as I detailed in this issue/question: quarto-dev/quarto-cli#11839.