BDK Playground 404

[jlopp]

My link to the Playground at https://bitcoindevkit.org/bdk-cli/playground/ seems to have broken.

Is the playground no longer maintained by BDK?

[notmandatory]

The bdk-cli is still in the process of being upgrade to 1.0 and after that's done I'm hoping we can get the playground page revived too. If you run into any devs who'd like to take it on I'm happy to help get them started.