Require use of Node version >=18

We had a problem with deploying portal on Node 16. We're adding Node
configuration required for successfull deploy of the portal.
Also updating README.

README.md

@@ -1,33 +1,31 @@
-# Example Token Bridge UI · [![GitHub license](https://img.shields.io/badge/license-Apache2.0-blue.svg)](https://github.com/wormhole-foundation/example-token-bridge-ui/blob/main/LICENSE) ![Build](https://github.com/wormhole-foundation/example-token-bridge-ui/actions/workflows/build.yaml/badge.svg)
+# Example Token Bridge UI
 
-This app serves as a testnet and local devnet UI for the example token bridge contracts.
+This repository is a fork of Wormhole's [example Token Bridge
+UI](https://wormhole-foundation.github.io/example-token-bridge-ui/). Support for
+Base Sepolia, Optimism Sepolia and Arbitrum Sepolia was added.
 
-View at https://wormhole-foundation.github.io/example-token-bridge-ui/
+Deployed code can be used to attest/register tokens on L2 chains (when deloyed
+locally, this can be done from http://localhost:3000/#/register) and to bridge
+tokens between chains (http://localhost:3000/#/transfer).
 
-## Install
+## Local deploy:
 
-```bash
-npm ci
-```
-
-## Develop
-
-If using the node version specified in `.nvmrc`, run with
+To deploy locally, execute:
 
 ```bash
+nvm use 18
+npm ci
 npm start
 ```
 
-If on latest LTS (v18.16.0), run with
+## Deploy using `serve`:
 
-```bash
-NODE_OPTIONS=--openssl-legacy-provider npm start
-```
-
-*Note: the above issue should be resolved after updating to the latest mui + react versions*
-
-## Build
+To deploy using `serve` as a static server, execute:
 
 ```bash
+nvm use 18
+npm ci
 npm run build
+serve -s build -l 4000
 ```
+

package.json

@@ -64,8 +64,8 @@
     "use-debounce": "^7.0.0"
   },
   "scripts": {
-    "start": "react-app-rewired start",
-    "build": "react-app-rewired --max_old_space_size=6144 build",
+    "start": "NODE_OPTIONS=--openssl-legacy-provider react-app-rewired start",
+    "build": "NODE_OPTIONS=--openssl-legacy-provider react-app-rewired --max_old_space_size=6144 build",
     "test": "react-app-rewired test",
     "eject": "react-scripts eject"
   },
@@ -125,5 +125,8 @@
     "url": "^0.11.0",
     "util": "^0.12.4",
     "vm-browserify": "^1.1.2"
+  },
+  "engines": {
+    "node": ">=16"
   }
 }