feat: add HEAD route for '/' to support status checks #835
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Services like uptime-robot use a HEAD request to do status checks; this discards the response body and returns only headers. I've added a head route on top of '/' that returns properly. Right now uvicorn returns a 405 method not allowed
This doesn't interfere with the GET wildcard route, but we can easily move this over to a /status route if so desired.