Cron Worker to fetch guild count and send it to https://discord.bots.gg API.

1. nix-shell (skip if you have node installed from another source, then use npx wrangler for below)
2. npm install
3. wrangler secret put DBOTS_TOKEN
4. wrangler secret put TOKENS - this should map bot IDs to Discord tokens and be of the form {"12345": "tokenhere"}.
5. wrangler kv:namespace create KV and update the wrangler.toml entry with the new ID.
6. Optional: wrangler secret put HTTPSECRET - this is used to authenticate manual invocations over HTTP, useful for testing in production.
7. wrangler deploy