Suggestion: way to retrieve stats for blocklist

[spdustin]

If I'm sharing a blocklist, it'd be handy to have a simple endpoint I can hit to get a JSON object with basic stats on how many subscribers I have, and perhaps worker status.

Unless that already exists and I'm missing it on the hosted blocktogether.org?

Can help with awareness campaigns to be able to poll an endpoint every so often, and use the response to automate promotional messages like "we just surpassed 50,000 subscribers to our #BlockTogether list!"

If you're keen (and it would make it into the public hosted version) I could take a crack at it and submit a PR. Thoughts?