Unable to determine the repository root URL for the navbar link. This can happen when a string is passed to the `repo` keyword of `makedocs`. To remove this warning, either pass a Remotes.Remote object to `repo` to completely specify the remote repository, or explicitly set the remote URL by setting `repolink` via `makedocs(format = HTML(repolink = "..."), ...)`.

removing `stable` and linking `stable` to `v0.6.18`.

removing `v0.6` and linking `v0.6` to `v0.6.18`.

removing `v0.5` and linking `v0.5` to `v0.5.0`.

removing `v0.3` and linking `v0.3` to `v0.3.1`.

removing `v0.2` and linking `v0.2` to `v0.2.4`.