Update the "Stake" and "Add liquidity" tutorials

[LoznianuAnamaria]

The "Risks" section from the pool and trade tabs will be removed with: oceanprotocol/market#1369
Once that change is merged, we need to update the tutorials

[LoznianuAnamaria]

@akshay-ap We can update the tutorials, as @jamiehewitt15 merged the changes to remove the risks section.