Sidecar Example README: Switch to relative paths (#617)
Sidecar Example README: Switch to relative paths (#617)

Just to avoid fragility with updates to examples breaking past release
examples, I switched the README on this example to using relative links,
so that people didn't end up being directed to pull from main, which
will likely break at some point.

Work on #546
googleforgames/quilkin,googleforgames/quilkin,googleforgames/quilkin,googleforgames/quilkin,googleforgames/quilkin,googleforgames/quilkin