docs: base icon path configuration for auto-icons

[Sbrjt]

Overview

Added instructions for configuring base icon path in wxt.config.ts.

import { resolve } from 'node:path'
import { defineConfig } from 'wxt'

export default defineConfig({
  modules: ['@wxt-dev/module-react', '@wxt-dev/auto-icons'],
  autoIcons: {
    baseIconPath: resolve('public/icon.svg'),
  },
}

Manual Testing

None

Related Issue

None

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[PatrykKuniczak]

Let's merge it with:
https://github.com/wxt-dev/wxt/pull/2285/changes#diff-e6554a3c82501208ee1d70b8db5ca82b288ac8dfde1be3c11887cccf81ab74b0R32-R44

To simplify, because it seems redundant.