update applause-button-api

[jwarren-scottlogic]

Updating the applause button api (which has been moved to sl aws).

There isn't unfortunately a nice way to store the url in one place, but I could get something working if this is important.

[ColinEberhardt]

We are seeing cross-origin failures for 'get-claps'.

See for example: https://jwarren-scottlogic.github.io/blog/2024/08/05/beyond-the-hype-is-observability-just-the-new-name-for-system-monitoring.html