Fix missing API navbar link when ApiPath has more than 1 segment

Author: ociaw

input/Shared/_RightNavigation.cshtml

@@ -1,9 +1,12 @@
-@foreach(IDocument doc in OutputPages.GetChildrenOf("index.html")
-    .Where(x => x.GetBool(SiteKeys.ShowInNavigation, true))
-    .OrderBy(x => x.GetInt(Keys.Order)))
-{
-    // Don't add the home page to the nav bar
-    if (doc.Destination != "index.html")
+@{
+    String indexFileName = Context.Settings.GetIndexFileName();
+    foreach(IDocument doc in OutputPages.GetChildrenOf(indexFileName)
+        // Ensure the API path is added even if it's not a direct child of the root page
+        .Concat(OutputPages.Get(NormalizedPath.Combine(Context.GetPath(DocsKeys.ApiPath), indexFileName)))
+        .Where(x => x.GetBool(SiteKeys.ShowInNavigation, true))
+        // Ensure that duplicate API links aren't shown 
+        .Distinct()
+        .OrderBy(x => x.GetInt(Keys.Order)))
     {
         <li class="nav-item">
             @Html.DocumentLink(