feat: support locally loaded custom fonts

[harlan-zw]

Description

Allows custom local fonts to be loaded easily through the config.

 ogImage: {
    fonts: [
      {
        name: 'optieinstein',
        weight: 800,
        path: '/OPTIEinstein-Black.otf',
      }
  ]
}

Linked Issues

https://github.com/harlan-zw/nuxt-og-image/issues/42

Additional context

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