hpg/content/.vitepress/theme/index.js

import DefaultTheme from 'vitepress/theme-without-fonts';
import DownloadLink from './DownloadLink.vue';
import './custom.css';

/** @type {import('vitepress').Theme} */
export default {
  extends: DefaultTheme,
  enhanceApp({ app }) {
    app.component('DownloadLink', DownloadLink);
  }
};