https://github.com/go-gitea/gitea/pull/5131 introduced the option `ENABLE_USER_HEATMAP` but it seems to be missing in [app.ini.sample](https://github.com/go-gitea/gitea/blob/master/custom/conf/app.ini.sample). There is a `HEATMAP_COLOR_RANGE` in there, thought. cc: @kolaente