docs(site): fix Clawd setup link

docs/clawd-md.md

@@ -0,0 +1,13 @@
+---
+summary: "Redirect: /clawd.md → /clawd"
+permalink: /clawd.md
+---
+
+<!-- {% raw %} -->
+<script>
+  window.location.replace("{{ \"/clawd\" | relative_url }}");
+</script>
+
+If you’re not redirected automatically, go to
+<a href="{{ \"/clawd\" | relative_url }}">/clawd</a>.
+<!-- {% endraw %} -->