Should load Blockchain related parameters from the config file

[Shachindra]

For Example

1. In assets page: Etherscan Transaction should take the base URL from the config file, price should have a logo for which url can be taken from the same config file
2. On explore screen buy price (ETH) logo should be changed to the asset supported (Like Matic for Polygon Network)

This helps in enabling the webapp support multi blockchain network