Typescript Config File Support

[joshmossas]

Goals of this feature:

• Make it possible to use a typescript config file such as contentful-hugo.config.ts.
• Enabled autocomplete with a defineConfig method similar to nuxt (see here) and vite (see here)
• Support ES6 import/exports

// contentful-hugo.config.ts
import { defineConfig } from 'contentful-hugo';

export default defineConfig({
  // config goes here
})

[joshmossas]

closed by #66