Default value for out option

[DiFuks]

Hello! I am the author of the typedoc-theme-hierarchy library

When the "out" option is not specified, I can't figure out where to copy the custom css and js for my theme

DiFuks/typedoc-theme-hierarchy#17

A possible solution is to return the default value, namely "docs"

typedoc/bin/typedoc

Line 80 in c75f44f

await app.generateDocs(project, "./docs");

I can solve this problem by specifying "docs" as the default knowledge on my end. But this can break if the path to the generated folder changes on your end.

[Gerrit0]

The original reason it was done like this was so that TypeDoc could check if the json/docs options were set, and not generate docs if json was set, since there's an isSet method on options now, seems like a reasonable change.