fix: Add Netlify Edge function to block China from accessing feed.xml (#796)

* Initial plan

* Initial plan for feed.xml geo-blocking edge function

Co-authored-by: nzakas <38546+nzakas@users.noreply.github.com>

* Add Netlify Edge function to block China from accessing feed.xml

Co-authored-by: nzakas <38546+nzakas@users.noreply.github.com>

* Simplify feed.ts edge function by removing unused variables

Co-authored-by: nzakas <38546+nzakas@users.noreply.github.com>

* Use config export in feed.ts instead of netlify.toml configuration

Co-authored-by: nzakas <38546+nzakas@users.noreply.github.com>

* Revert accidental changes to package-lock.json

Co-authored-by: nzakas <38546+nzakas@users.noreply.github.com>

* Apply suggestion from @nzakas

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: nzakas <38546+nzakas@users.noreply.github.com>
Co-authored-by: Nicholas C. Zakas <nicholas@humanwhocodes.com>

Author: Copilot

functions/feed.ts

@@ -0,0 +1,19 @@
+export const config = {
+    path: "/feed.xml"
+}
+
+export default async function handler(req: Request, context: any) {
+    // Get the country code from Netlify's geo-location context
+    const country = context.geo?.country?.code;
+    
+    // Block requests from China (CN)
+    if (country === "CN") {
+        return new Response("Access denied", {
+            status: 403,
+            headers: {
+                "Content-Type": "text/plain",
+            },
+        });
+    }
+    
+}