chore(versions): unity 2022.3.21, net core 8.0, signalr 8.0.2, nuget …

…6.9.1; update examples

upgrades -> unity 2021.3.11, net core 6.0, signalr 6.0.10, nuget 6.3.…

…1; remove node/client & move build to server static dir

add onreconnecting/ed events; update readme

update readme for 0.0.3

update readme; remove screenshots

move signalr script to the plugin lib dir; update readme