relocate onto new domain name and npm package

current/old situation:
- npm package: `sparrow-rtc`
- demo domain: `sparrow.benev.gg`
- signaller server: `signaller.sparrow.benev.gg`

proposed new situation:
- npm package: `@benev/sparrow`
- demo domain: `sparrow.benevolent.games`
- signaller server: `signaller.sparrow.benevolent.games`