fix(worker): Remove rate-limiting (#14)

Trying to rate-limit using global state, in a stateless context such as a worker,
is obviously not going to work.

There is an official Rate Limiting API in beta:
https://developers.cloudflare.com/workers/runtime-apis/bindings/rate-limit/

However, that requires lots of setup. For now, let's remove the broken code.

worker/src/main.ts

@@ -17,9 +17,6 @@ function validateEnvironment(env: Record<string, string | undefined>): Config {
 }
 
 const API = new URL('https://api.cloudflare.com/client/v4/')
-const RATE_LIMIT_MS = 30_000
-
-let lastRequest = 0
 
 export default {
   async fetch(req: Request, env: Record<string, string | undefined>, ctx: unknown): Promise<Response> {
@@ -42,18 +39,6 @@ export default {
       return new Response('Unauthorized', { status: 401 })
     }
 
-    // Throttle updates to not overload the Cloudflare API
-    const now = Date.now()
-    if (now - lastRequest < RATE_LIMIT_MS) {
-      return new Response('Too Many Requests', {
-        status: 429,
-        headers: {
-          'Retry-After': Math.ceil((lastRequest + RATE_LIMIT_MS - now) / 1000).toString()
-        }
-      })
-    }
-    lastRequest = now
-
     // TOOD support IPv6
     if (!/(\d+\.){3}(\d+)/.test(remoteAddress)) {
       return new Response('Bad Request', { status: 400 })