Support links to sidebar sections

[hatton]

trafficstars

In Notion, you can of course link to one of the pages that serve as sections in the outline. But when docu-notion sees such a link, it doesn't find the page, and logs

Could not find the target of this link. Note that links to outline sections are not supported. ded7393e-8194-4a68-ac04-81839baadac3

Docusaurus does now support links to sidebar sections that have auto-generated table of contents for the direct children. So if a project turned on that capability, it would make sense for docu-notion to be able to generate the link to get to it.