Add a static site generator

There is no build for the element or site utilities like PrismJS yet, so this site only works locally at the moment.

.eleventy.cjs

@@ -0,0 +1,15 @@
+const syntaxHighlight = require("@11ty/eleventy-plugin-syntaxhighlight");
+
+module.exports = function(eleventyConfig) {
+  eleventyConfig.addPlugin(syntaxHighlight);
+  return {
+    dir: {
+      input: "docs-src",
+      output: "docs"
+    },
+    templateExtensionAliases: {
+      "11ty.cjs": "11ty.js",
+      "11tydata.cjs": "11tydata.js"
+    }
+  };
+};