First commit of i18n base blog using Eleventy v2. This uses English-implied URLs.

en/en.11tydata.js

@@ -0,0 +1,9 @@
+module.exports = {
+  lang: "en",
+  permalink: function(data) {
+    // Change (English) /en/blog/my-post URLs to have an implied language code /blog/my-post URLs instead.
+    let [slashPrefixEmpty, langCode, ...stem] = data.page.filePathStem.split("/");
+    let path = stem.join("/");
+    return stem[stem.length - 1] === "index" ? `${path}.html` : `${path}/index.html`;
+  }
+}