Fix "Link to Deployment in Explorer is Undefined" Issue (#134)

This PR updates the logic for constructing the blockchain explorer URL
to dynamically adjust based on the selected blockchain environment
(Milkomeda or Ethereum Classic). The issue was that the deployment link
was not correctly directing users to the appropriate blockchain explorer
for Ethereum Classic.

**Changes Made:**
- Added a conditional check for the REACT_APP_BC environment variable to
determine the active blockchain environment (Milkomeda or Ethereum
Classic).
- Updated the <a> tag to dynamically use the correct explorer URL:
REACT_APP_MILKOMEDA_C1_EXPLORER for Milkomeda.
REACT_APP_EXPLORER for Ethereum Classic.

For Eth-Classic

![image](https://github.com/user-attachments/assets/aa534d85-a3c3-4a1d-8082-f9d513f85146)

For Milkomeda 

![image](https://github.com/user-attachments/assets/7e3fb326-bd64-4248-b1f8-11775fe89552)

Both work perfectly

env/milkomeda-testnet.env

@@ -6,7 +6,7 @@ REACT_APP_CHAIN_ID=200101
 REACT_APP_DJED_ADDRESS=0xc4C0669Ea7BFF70A6cFa5905A0Ba487fC181Dc37
 REACT_APP_FEE_UI=0
 REACT_APP_UI=0x0232556C83791b8291E9b23BfEa7d67405Bd9839
-REACT_APP_MILKOMEDA_C1_EXPLORER=https://explorer-devnet-cardano-evm.c1.milkomeda.com/
+REACT_APP_EXPLORER=https://explorer-devnet-cardano-evm.c1.milkomeda.com/
 REACT_APP_BC=Milkomeda
 REACT_APP_PROTOCOL_CHAIN_DESCRIPTION=Milkomeda is the EVM-compatible chain of the Cardano ecosystem. Its native currency is mADA, a bridged version of Cardano`s ADA
 REACT_APP_CHAIN_COIN=mADA

env/milkomeda.env

@@ -6,7 +6,7 @@ REACT_APP_CHAIN_ID=2001
 REACT_APP_DJED_ADDRESS=0x67A30B399F5Ed499C1a6Bc0358FA6e42Ea4BCe76
 REACT_APP_FEE_UI=0.01
 REACT_APP_UI=0x6AfD84920971Ba96118a302deaA6d11e7ce18b03
-REACT_APP_MILKOMEDA_C1_EXPLORER=https://explorer-mainnet-cardano-evm.c1.milkomeda.com/
+REACT_APP_EXPLORER=https://explorer-mainnet-cardano-evm.c1.milkomeda.com/
 REACT_APP_BC=Milkomeda
 REACT_APP_PROTOCOL_CHAIN_DESCRIPTION=Milkomeda is the EVM-compatible chain of the Cardano ecosystem. Its native currency is mADA, a bridged version of Cardano`s ADA
 REACT_APP_CHAIN_COIN=mADA

package.json

@@ -10,6 +10,7 @@
     "aria-query": "^5.3.0",
     "assert": "^2.0.0",
     "bignumber.js": "^9.1.1",
+    "caniuse-lite": "^1.0.30001690",
     "ethers": "^5.7.2",
     "milkomeda-wsc-ui-test-beta": "1.0.20",
     "react": "^17.0.2",

src/routes/protocol.jsx

@@ -51,7 +51,7 @@ export default function Protocol() {
               </a>
               . Here you can interact with a{" "}
               <a
-                href={`${process.env.REACT_APP_MILKOMEDA_C1_EXPLORER}/address/${process.env.REACT_APP_DJED_ADDRESS}`}
+                href={`${process.env.REACT_APP_EXPLORER}/address/${process.env.REACT_APP_DJED_ADDRESS}`}
                 target="_blank"
                 rel="noreferrer"
               >