generate OpenGraph image for pages

[syphar]

see https://github.com/rust-lang/crates.io/pulls?q=is%3Apr+is%3Aclosed+opengraph for the crates.io implementation and their subcrate.

I imagine it's an image to be generated for each crate.

These would then be

example from this crates.io page is this image. I imagine some details might be different.

This needs typst locally installed on the docs.rs server.

[syphar]

perhaps also check other OpenGraph attributes, see github:

from https://github.com/dawedawe/ferriby