Document all public functions from quarto Lua API

[cderv]

About those new function missing in our doc

quarto.doc.input_file
quarto.doc.output_file

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Yep, it will available to any LUA code that is being executed (e.g. filter or shortcode)- it is public but you're right that it is omitted from the documentation (unintentionally)!

We also added some project related functions that are omitted:

quarto.project.directory
quarto.project.offset
quarto.project.profile
quarto.project.output_directory

Let's keep this issue open to track getting the documentation updated to reflect this.

Originally posted by @dragonstyle in #2249 (comment)

[cwickham]

Relevant doc page: https://quarto.org/docs/extensions/lua-api.html#quarto-lua-api