feat: add iconify API configuration option

[ace-of-aces]

Acknowledges #34

• adds a configuration option for providing a custom Iconify API url, as well as an option to keep the default as fallback

  // app.config.ts
  export default defineAppConfig({
  nuxtIcon: {
  // ...
  iconifyApiOptions: {
    url: 'https://<your-api-url>',
    publicApiFallback: true // default: false
  }
  }
  })

• implements an option for GDPR compliance
• adds according documentation
• does not resolve the feature request of offline asset bundling

Calls addAPIProvider() from @iconify/vue internally. 👉🏻 Reference

[what-the-diff[bot]]

PR Summary

• ReadMe Update for Module Behavior Modification Added a new section in the README.md file with details on how to modify the default behavior of the module. This is accomplished by adjusting the nuxtIcon.iconifyApiOptions.url and nuxtIcon.iconifyApiOptions.publicApiFallback property settings.

• Dependency Version Uplift Updated the @nuxt/devtools dependency in the package.json file from version 0.8.5 to 1.0.0. This update brings the benefits of the latest stable version.

• New Properties in module.ts Added two new properties in the module.ts file. These properties - iconifyApiOptions.url and iconifyApiOptions.publicApiFallback allow for setting a custom Iconify API URL and establishing a public Iconify API as a fallback.

• Improvements to Icon.vue file The Icon.vue file now allows users to import and use the addAPIProvider function from the @iconify/vue package. It has an added feature that verifies and accepts the Input Iconify API URL. This change allows for the use of custom API.

• **Enhancements to IconCSS.vue file` The IconCSS.vue file has been updated with features that authenticate and accept custom Iconify API URL. This not only enables the use of custom API but also sets the base URL for the icon URL as per user requirements.