Implement policy snippets

examples/snippets/challenges-non-js.yml

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+challenges:
+  # Challenges with a cookie, self redirect (non-JS, requires HTTP parsing)
+  cookie:
+    runtime: "cookie"
+
+  # Challenges with a redirect via Link header with rel=preload and early hints (non-JS, requires HTTP parsing, fetching and logic)
+  # Works on HTTP/2 and above!
+  preload-link:
+    condition: '"Sec-Fetch-Mode" in headers && headers["Sec-Fetch-Mode"] == "navigate"'
+    runtime: "preload-link"
+    parameters:
+      preload-early-hint-deadline: 3s
+
+  # Challenges with a redirect via Refresh header (non-JS, requires HTTP parsing and logic)
+  header-refresh:
+    runtime: "refresh"
+    parameters:
+      refresh-via: "header"
+
+  # Challenges with a redirect via Refresh meta (non-JS, requires HTML parsing and logic)
+  meta-refresh:
+    runtime: "refresh"
+    parameters:
+      refresh-via: "meta"
+
+  # Challenges with loading a random CSS or image document (non-JS, requires HTML parsing and logic)
+  resource-load:
+    runtime: "resource-load"