feat(11ty): add config file && sorted defintion collection

.eleventy.js

@@ -0,0 +1,24 @@
+module.exports = function (config) {
+  // Add a filter using the Config API
+  // config.addFilter("myFilter", function () { });
+
+  // Add collections here
+  config.addCollection('definitions', collection => {
+    return [
+      ...collection
+        .getFilteredByGlob('./11ty/definitions/*.md')
+        .sort((a, b) => {
+          // `toLowerCase()` is just a safety measure, slugs should be lower case anyway
+          // `localeCompare()` is super cool: http://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/localeCompare
+          return a.data.slug.toLowerCase().localeCompare(b.data.slug.toLowerCase())
+        })]
+  })
+
+  // You can return your Config object (optional).
+  return {
+    dir: {
+      input: "11ty",
+      output: "dist"
+    }
+  };
+};