dark mode on slack web code example

Example: slack darkmode

impl LiquiditySource for UniswapLiquiditySource {
    async fn get_liquidity() -> Result<Liquidity> {
         //...
         Ok(Liquidity::Swap(/*... */))
    }
}

impl LiquiditySource for SushiSwapLiquiditySource {
    async fn get_liquidity() -> Result<Liquidity> {
         //...
         Ok(Liquidity::Swap(/*... */))
    }
}