refactor!: server add/rm has better UI/UX

Less confusing logging messages, clear "is created" / "already exists"
output. Move the majority of logging to debug output to not confuse the
situation. Some code cleanups also in there.

pkg/server/server.go

@@ -17,11 +17,11 @@ func CreateServerDir(serverName string) error {
 			return err
 		}
 
-		logrus.Infof("%s already exists", serverPath)
+		logrus.Debugf("%s already exists", serverPath)
 		return nil
 	}
 
-	logrus.Infof("successfully created %s", serverPath)
+	logrus.Debugf("successfully created %s", serverPath)
 
 	return nil
 }