Updates and new features

See merge request !8

backend: update deno version for websocket panic fix

See merge request !7

We preivously ran into a fatal race condition in deno's websocket stack.
See
https://github.com/denoland/deno/issues/14240#issuecomment-1270647068
for details.

This issue was fixed in deno v1.36.1:
https://github.com/denoland/deno/issues/14240#issuecomment-1675729271