Disable import wallet functionality with const flag (#14)

Part of [laconicd testnet validator enrollment](https://www.notion.so/laconicd-testnet-validator-enrollment-6fc1d3cafcc64fef8c5ed3affa27c675)

Co-authored-by: Shreerang Kale <shreerangkale@gmail.com>
Reviewed-on: cerc-io/laconic-wallet-web#14

src/components/ImportWalletDialog.tsx

@@ -61,6 +61,6 @@ const ImportWalletDialog = ({
       </DialogActions>
     </Dialog>
   );
-}
+};
 
 export default ImportWalletDialog;

src/screens/HomeScreen.tsx

@@ -19,6 +19,7 @@ import { useAccounts } from '../context/AccountsContext';
 import { useWalletConnect } from '../context/WalletConnectContext';
 import { NetworksDataState, StackParamsList } from '../types';
 import { useNetworks } from '../context/NetworksContext';
+import { IS_IMPORT_WALLET_ENABLED } from '../utils/constants';
 
 const WCLogo = () => {
   return (
@@ -104,7 +105,7 @@ const HomeScreen = () => {
         setImportWalletDialog(false);
       }
     } catch (error: any) {
-      setInvalidMnemonicError((error.message as string).toUpperCase())
+      setInvalidMnemonicError((error.message as string).toUpperCase());
       setToastVisible(true);
     }
   };
@@ -177,13 +178,13 @@ const HomeScreen = () => {
             isWalletCreating={isWalletCreating}
             createWalletHandler={createWalletHandler}
           />
-          <View style={styles.createWalletContainer}>
+          { IS_IMPORT_WALLET_ENABLED && <View style={styles.createWalletContainer}>
             <Button
               mode="contained"
               onPress={() => setImportWalletDialog(true)}>
             Import Wallet
             </Button>
-          </View>
+          </View> }
         </>
       )}
       <ImportWalletDialog

src/utils/constants.ts

@@ -46,3 +46,5 @@ export const EMPTY_FIELD_ERROR = 'Field cannot be empty';
 export const INVALID_URL_ERROR = 'Invalid URL';
 
 export const IS_NUMBER_REGEX = /^\d+$/;
+
+export const IS_IMPORT_WALLET_ENABLED = false;