Embed external documents (in sidebar)

For those of us working with visual files (Figma, Whimsical, Canva, etc.) or code (Github, Codespace, Codepen, etc.), it's a little difficult to bring those file into the project currently: you have to create a Doc, and paste a link to your external document/workspace inside. Which is a bit cumbersome, because you end up with a link in your sidebar pointing to a Doc that is basically empty.

It would be awesome to be able to set a link directly to an external page in the sidebar instead.

Even better would be for the external page to be embedded (even if it's just a view-only mode that opens a new tab when clicked)

This would essentially bring all the project files under the same roof - way easier to understand for clients, and nicer to work with for freelancers / teams / agencies 🙌