Problems with absLangURL

_Hugo newbie here so sorry if question is silly and all. If my approach below is totally wrong I'd appreciate suggestions on how it could be fixed_

Is there a particular reason why layouts/partials/head.html uses
```
{{ .Site.Title }}
```
rather than just
```
{{ .Site.Title }}
```
?

The background for the question: I'd like my GitHub pages (at https://yugr.github.io) to provide several websites (currently it's just https://yugr.github.io/recovering-teamlead but I'd like to be able to add say https://yugr.github.io/pink-ponies-for-everyone in future). For this I have a separate subdirectory for each blog with custom `baseURL` attribute (I believe this approach is relatively common). E.g. for https://yugr.github.io/recovering-teamlead I set
```
baseURL = 'https://yugr.github.io/recovering-teamlead/'
```
in my [hugo.toml](https://github.com/yugr/yugr.github.io/blob/main/recovering-teamlead/hugo.toml).

Unfortunately `absLangURL "/"` evaluates to `https://yugr.github.io` (rather than `https://yugr.github.io/recovering-teamlead/` as I would expect) which gives reader 404.

I believe same issue will apply to other calls to `absURL`.

Start in layouts/partials/head.html and inspect how absLangURL "/" is resolved against the site configuration. Reproduce the build with the recovering-teamlead hugo.toml and its subdirectory baseURL, then compare the generated link with .Site.BaseURL. Done means the site-title link preserves /recovering-teamlead/ and does not lead to a 404.

Written by the indexing model from the issue text.