[kubaplas]

Documents odradev/odra#708, odradev/odra#709 and odradev/cargo-odra#115–#117 in the unreleased docs (docusaurus/docs); the versioned 2.10 docs are not touched. Merge once those are in, as the pages describe Odra 2.11.0 and cargo-odra 0.2.1.

• Cargo Odra → tests: arguments after -- go to the test binary (-- two, -- --nocapture), arguments for cargo test itself before a second --; a note says what works before cargo-odra 0.2.1 (only the name filter) and how to get --nocapture there.
• Odra.toml → Linking the other crate (new section): why a dependency's contract needs a reference, odra::link_contract_crates!(), the two cases that still need a use, and the error cargo odra build gives when it is missing. The page did not mention the manual use step at all before.
• Directory structure: one sentence on the macro line in the build binaries.
• Building contracts manually: the ODRA_MODULE__<crate> and ODRA_BUILD_PROTOCOL variables cargo odra sets.
• Migration guide to v2.11.0 (new; the 3.0.0 guide moves one place down in the sidebar): the cargo odra test argument change, the optional macro line, faster builds. It covers these tooling changes only; add other 2.11 changes there as they land.

npm run build passes with no broken links; static/llms.txt gained the new page.

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