OptionalextraAdd extra locations beyond the canonical URL for specific document types.
OptionalmainStatic mainDocuments entries for URL → document resolution.
Since mainDocuments must be an array at config time (not reactive),
pass them explicitly if you need the Presentation tool to resolve
URLs back to documents.
These are passed through directly to the Presentation tool's
resolve.mainDocuments option.
Options for customizing the auto-generated Presentation tool config.