docs(docs): add initial Fumadocs-based documentation site

docs/README.md

@@ -0,0 +1,13 @@
+# docs
+
+This is a Waku application generated with [Create Fumadocs](https://github.com/fuma-nama/fumadocs).
+
+Run development server:
+
+```bash
+npm run dev
+# or
+pnpm dev
+# or
+yarn dev
+```