add document title as exported document title metadata

[Erwan-le-Gall]

Feature Request

label: accessibility

When I add a title to a Docs document.

Then I want this title to be added as the title metadata of the exported DOCX/PDF document.

This a requirement for accessibility.

[Erwan-le-Gall]

ping @cyberbaloo

[Erwan-le-Gall]

@virgile-dev @AntoLC

I think the answer is in:

Document / Valid props / title
https://react-pdf.org/components#:~:text=sets%20title%20info%20on%20the%20document's%20metadata