Add initial 11ty website structure

website/node_modules/posthtml-match-helper/lib/index.d.ts

@@ -0,0 +1,10 @@
+import type { AttrMatcher, StringMatcher } from "posthtml";
+
+interface Matcher {
+  tag?: StringMatcher;
+  attrs: AttrMatcher;
+}
+
+declare function createMatcher(matcher: string | string[]): Matcher | Matcher[];
+
+export default createMatcher;