Track the best path for a submodule that was added

For Agda, this is a proxy for 'root directory' of a project

Signed-off-by: Danila Fedorin <danila.fedorin@gmail.com>

layouts/partials/geturl.html

@@ -6,6 +6,7 @@
 {{ $bestLength := $scratch.Get "bestLength" }}
 {{ if and (le $bestLength (len $path)) (hasPrefix $filePath $path) }}
 {{ $scratch.Set "bestLength" (len $path) }}
+{{ $scratch.Set "bestPath" $path }}
 {{ $scratch.Set "bestUrl" (printf "%s%s" $url (strings.TrimPrefix $path $filePath)) }}
 {{ end }}
 {{ end }}