Add environmental variable for web socket ip in the local dev instructions

[NoahBres]

Add environmental variable for web socket ip in the local dev instructions.

Perhaps also detail a project structure and basic workings overview (how telemetry is ingested from redux into props, etc.) to make contribution a little easier.

[rbrott]

Add environmental variable for web socket ip in the local dev instructions.

I'll add a note.

Perhaps also detail a project structure and basic workings overview (how telemetry is ingested from redux into props, etc.) to make contribution a little easier.

I'll consider more extensive documentation of internals. With the current number of contributors, I'm happy to give individualized code pointers for specific changes.