Update dependencies and scripts in adapter-electron for improved functionality

- Added `nodemon` and `wait-on` as dependencies in the electron example's package.json for better development experience.
- Updated the `dev` script to utilize `wait-on` for ensuring the Vite server is running before starting Electron.
- Enhanced the README.md with clearer instructions and examples for configuring the adapter and its options.
- Removed the `functions` option from the TypeScript definition to simplify the interface.
- Cleaned up unused imports in setupHandler.js to streamline the code.

packages/adapter-electron/index.js

@@ -1,6 +1,5 @@
 // adapter-electron.js
 import { readFileSync, writeFileSync } from 'node:fs';
-import fs from 'node:fs';
 import path from 'node:path';
 import { rollup, watch as rollupWatch } from 'rollup';
 import { nodeResolve } from '@rollup/plugin-node-resolve';
@@ -159,6 +158,7 @@ export default function (opts = {}) {
 /**
  * Vite plugin to build Electron main/preload files using Rollup
  * Usage: import { electronPlugin } from 'adapter-electron'
+ * @param {import('./index.d.ts').ElectronPluginOptions} options - Configuration options
  */
 export function electronPlugin(options = {}) {
   const {