mongodb credentials leaked in github

## Steps To Reproduce: [add details for how we can reproduce the issue] 1. Go to [values.yaml file](https://github.com/Sifchain/sifnode/blob/740331dad061ee0f5a3cf3798d429f294b70f0ae/deploy/helm/block-explorer/values.yaml) file. 2.Check from line 23: ``` blockExplorer: args: mongoUsername: "mongodb" mongoPassword: mongoDatabase: "block_explorer" env: rootURL: "http://localhost:3000" chainnet: "" genesisURL: "" remote: rpcURL: "" apiURL: "" ``` {F1288433} ## Supporting Material/References: [list any additional material (e.g. screenshots, logs, etc.)] * [attachment / reference] F1288433 ## Impact I believe that this database has the data of https://blockexplorer.sifchain.finance/blocks ,so an attacker can access the database and control it.