[Staking App] MerkleDrop Subgraph issue

[dimsome]

Describe the bug
On the staking page https://staking.mstable.app/#/stake the MerkleDrop subgraph is queried, however a error is returned Type Query has no field accounts

To Reproduce
Steps to reproduce the behavior:

1. Go to https://staking.mstable.app/#/stake
2. Connect Wallet
3. Subgraph error
4. Click on Verify claim, to see a further error

Expected behavior
No Error

[calvinkei]

found the repo for the correct subgraph https://github.com/mstable/merkle-drop

however, subgraph studio does not support kovan, to fix this we need to reuse the hosted service endpoint