builtin_functions_reference does not update automatically

[AntonBogun]

The new change of write_file being able to write to a relative path was not automatically mirrored to the docs. I think an automatic doc update at each commit that influences the functions wouldn't be a bad idea.

[aardappel]

Not sure how we'd do that automatically.. it requires lobster.exe to be run with a particular flag.

[AntonBogun]

Could a github action be able to do this?

[aardappel]

I don't believe they can add to the commit they're testing..