Generate documentation for the workspace

[JonathanWoollett-Light]

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Describe the feature

Generate a single source of documentaiton for all crates in the workspace.

It is easier to search through documentation when it is all indexed by the same filter.

See https://github.com/rust-lang/cargo/issues/8229 and https://doc.rust-lang.org/nightly/rustdoc/unstable-features.html#--index-page-provide-a-top-level-landing-page-for-docs.

Acknowledgements

• [ ] I may be able to implement this feature request
• [ ] This feature might incur a breaking change