Lunr search can't find index.json when baseURL includes path

[flyinggrizzly]

If a site's config declares the baseURL to be something like http://www.example.com/sub/directory/, the search.html partial doesn't take this into account when defining the var baseurl for Lunr to consume.

<script type="text/javascript">
    {{ if .Site.IsMultiLingual }}
        var baseurl = "{{.Site.LanguagePrefix | relURL }}";
    {{ else }}
        var baseurl = '{{ "" | relURL }}';
    {{ end }}
</script>

In this case (for a single language site), the baseurl var is "/", not "/sub/directory/"

I can fix this for a single language site by replacing var baseurl = '{{ "" | relURL }}'; with var baseurl = '{{ .Site.BaseURL }}';

This leaves two problems that I'm not comfortable enough with Hugo or Go templating to solve:

1. multilanguage site are still broken
2. we've lost the benefits of relative URLs