[CI] Broken links

[mrcnski]

I randomly ran lychee on the repo and it found a number of false positives, but many links that are legitimately broken:

[./docs/contributor/DOCUMENTATION_GUIDELINES.md]:
✗ [ERR] file:///Users/marcin/Repos/github.com/paritytech/polkadot-sdk/docs/contributor/CODEOWNERS | Failed: Cannot find file
✗ [ERR] file:///Users/marcin/Repos/github.com/paritytech/polkadot-sdk/docs/rustfmt.toml | Failed: Cannot find file

[./polkadot/roadmap/implementers-guide/src/messaging.md]:
✗ [404] https://research.web3.foundation/en/latest/polkadot/XCMP.html | Failed: Network error: Not Found

[./bridges/docs/high-level-overview.md]:
✗ [ERR] file:///Users/marcin/Repos/github.com/paritytech/polkadot-sdk/bridges/relays/bin-substrate/src/cli/relay_headers_and_messages | Failed: Cannot find file
✗ [ERR] file:///Users/marcin/Repos/github.com/paritytech/polkadot-sdk/bridges/relays/finality | Failed: Cannot find file
✗ [ERR] file:///Users/marcin/Repos/github.com/paritytech/polkadot-sdk/bridges/relays/messages | Failed: Cannot find file
✗ [ERR] file:///Users/marcin/Repos/github.com/paritytech/polkadot-sdk/bridges/relays/parachains | Failed: Cannot find file

[./substrate/frame/sudo/README.md]:
⧖ [TIMEOUT] https://docs.rs/pallet-sudo/latest/pallet_sudo/struct.GenesisConfig.html | Timeout

etc, there are more. I saw we have a link-check job already that uses lychee, perhaps it can be revisited. cc @paritytech/ci

[mrcnski]

nvm, closing in favor of #134.