refactor: inline ready handler

pkg/handler/ready.go

@@ -1,16 +0,0 @@
-package handler
-
-import (
-	"net/http"
-)
-
-type readyHandler struct{}
-
-// NewReadyHandler returns a readiness probe handler.
-func NewReadyHandler() (http.Handler, error) {
-	return &readyHandler{}, nil
-}
-
-func (h *readyHandler) ServeHTTP(w http.ResponseWriter, _ *http.Request) {
-	w.WriteHeader(http.StatusOK)
-}