[BUGFIX-1] - Update typing

[DcBD]

Changed the type of the plugin function from Plugin to PluginOption due to changes in vite 3.0.0.

This may cause some typing issues when using vite < 3.0.0

There's simple workaround that shouldn't cause any isues, simply cast the hugoPlugin(..) to PluginOptions

e.g

import { defineConfig, PluginOption } from 'vite';

// https://vitejs.dev/config/
export default defineConfig({
    plugins: [
        hugoPlugin({ appDir, hugoOutDir }) as PluginOption
    ]
});