build: Use ES module system

- Update package.json with type
- Change eleventy config to use import and export
- Add comments for jshint and inspection

.eleventy.js

@@ -1,7 +1,10 @@
-const {EleventyHtmlBasePlugin} = require("@11ty/eleventy");
+/* jshint strict: false */
 
-module.exports = function (eleventyConfig) {
-	eleventyConfig.addPlugin(EleventyHtmlBasePlugin);
+import {HtmlBasePlugin} from "@11ty/eleventy";
+
+// noinspection JSUnusedGlobalSymbols
+export default async function (eleventyConfig) {
+	eleventyConfig.addPlugin(HtmlBasePlugin);
 
 	eleventyConfig.setLiquidOptions({
 		// greedy: false,
@@ -82,4 +85,4 @@ module.exports = function (eleventyConfig) {
 		templateFormats: ['html', 'liquid', 'njk', 'md']
 		// pathPrefix: './demo/'
 	};
-};
+}