Add Rust SDK documentation (quickstart and configuration pages)

[devin-ai-integration]

Add Rust SDK documentation (quickstart and configuration pages)

Summary

Adds documentation for the Rust SDK generator, which was previously listed as a "request demo" language. This PR:

• Creates quickstart page (overview/rust/quickstart.mdx) following the pattern of other SDK quickstart pages
• Creates configuration page (overview/rust/configuration.mdx) with clientName and enableWireTests options
• Adds version number snippet (version-number-rust.mdx) set to 0.13.4 (from latest changelog)
• Updates SDK introduction page to show Rust as a supported SDK with version number and changelog link (previously linked to demo request)
• Adds Rust section to sdks.yml navigation
• Adds Rust to the configuration CardGroup in generators-yml-reference.mdx

Review & Testing Checklist for Human

• Verify configuration options are complete and accurate - I derived clientName and enableWireTests from changelog entries, but there may be additional configuration options available for the Rust SDK generator that should be documented
• Verify the file structure in quickstart - The file tree showing Cargo.toml, src/lib.rs, src/client.rs, and types/ folder was inferred; please confirm this matches actual fern generate output for Rust
• Test the preview deployment - Verify the new pages render correctly and all links work (quickstart, configuration, changelog)
• Check that the Rust card on the introduction page displays correctly - Should show version number and changelog link like other supported SDKs

Recommended test plan: Run fern docs dev locally and navigate to /sdks/generators/rust/quickstart and /sdks/generators/rust/configuration to verify pages render correctly. Also check the SDK introduction page to confirm the Rust card displays properly with version and changelog.

Notes

• The existing overview/rust/changelog/ directory with changelog entries was already present in the repo
• Vale lint checks pass with no errors, warnings, or suggestions
• Link to Devin run: https://app.devin.ai/sessions/806e521a8aea44dd831be18e2edfaf69
• Requested by: unknown ()

[devin-ai-integration]

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