Props
-----

| Name | Type | Default | Description |
| ---- | ---- | ------- | ----------- |
| charset | string | null | Charset value. |
| title | string | null | Title value. |
| icon | string | null | Favicon file path. |
| meta | object | null | Meta values. |
| css | array | null | Css file urls. |
| js | array | null | Js file urls. |
| version | string | 'unknown' | Version number. |
| versionKey | string | 'v' | Key of version in query string. |