## What
Change the `documentation` field of the main `wickra` crate from the auto-generated rustdoc URL to the project's documentation site:
```toml
# crates/wickra/Cargo.toml
documentation = "https://docs.wickra.org" # was: https://docs.rs/wickra
```
## Why
On crates.io the "Documentation" link defaulted to `docs.rs/wickra`. The richer landing page for someone arriving from crates.io is the prose docs site — it carries the Rust quickstart, the API guide, and the full indicator catalogue. The auto-built docs.rs API reference stays reachable at `docs.rs/wickra`; only the crates.io link target changes.
## Scope
- Only the user-facing `wickra` crate is changed.
- `wickra-core` and `wickra-data` keep their `docs.rs` links — those low-level crates have no dedicated guide page on the docs site, so docs.rs remains the correct target for them.
- Metadata only; no code, build, or runtime change. Takes effect on the next crates.io publish.
kingchenc
b92ad32037