Feature Request: Generate sites based on nav hierarchy instead of site_name

[ct-alex-au]

Current Behavior:

Currently the mkdocs-monorepo-plugin generates the page based on site_name for each subrepos. This means that there is a strong coupling between the site_name and the url of the built docs.

Problems Related:

In case of the documentation owner wants to move a subrepo's documentation into another path, one should consult the subrepo owner to update the site_name, which reduces development efficiency.

Furthermore, due to the coupling between site_name and the generated path, one should set a url path as the site_name of the subrepo to retain the web semantic of the documentations. Thus, there's aesthetic concern when the subrepo's mkdocs built separately for internal purpose as the title now becomes a url path instead of a meaningful name.

Desired Behavior:

By default the generated documentations respect the hierarchy during the build, and making the coupling between the site_name and path as optional, e.g. specifying in the extra map inside the subrepo's mkdocs.yml