Text input for broadcast URL/path #767
Description
Currently, the hang-demo can be launched with a RELAY_URL via just web. Then you can use the ?path query parameter to select individual broadcasts.
That's kind of lame. We should have a simple form (below the fold) so it's easy to target arbitrary relays, broadcast names, etc. Bonus points if the broadcast names are auto-discovered via MoQ (drop-down instead of input text), so just pub tos would show both bbb and tos as valid options.