Draft: testing/owncast: new aport

https://owncast.online/ Self-hosted live video and web chat server for use with existing popular broadcasting software testing/

I'm not sure about a few things.

Should the static/ folder be in /var/lib/owncast? It includes a png, a template html and a video file. Not configurable.

Should the webroot/ folder be in /var/lib/owncast? These are mostly html/css files so maybe there's a better place (/usr/share/owncast?) but this isn't currently configurable (except maybe with -ldflags -X whatever). owncast also creates two directories under webroot/: webroot/backup and webroot/hls. I feel like webroot/hls should be in /var/cache/owncast. Again, not really configurable.