Remove `dotgraph` feature (#2848)
Apparently the implementation is broken and is generating warnings in the build. Not sure this was used any way by anyone. Closes: https://github.com/paritytech/polkadot-sdk/issues/2836
Apparently the implementation is broken and is generating warnings in the build. Not sure this was used any way by anyone. Closes: https://github.com/paritytech/polkadot-sdk/issues/2836