Allow adding both NS API docs and a link to the NS guide. (#166)

Author: msaelices

content/docs/en/elements/layouts/absolute-layout.md

@@ -1,6 +1,7 @@
 ---
 title: AbsoluteLayout
 apiRef: https://docs.nativescript.org/api-reference/modules/_ui_layouts_absolute_layout_
+docRef: https://docs.nativescript.org/ui/layouts/layout-containers#absolutelayout
 contributors: [rigor789, ikoevska]
 ---
 

layouts/docs.ejs

@@ -47,6 +47,14 @@
                          text-blue-dark p-4 my-8">
                         <p>
                             This is an overview of the most common usage of <%= current.title %>.
+                            <% if (current.docRef) { %>
+                            See <a href="<%= current.docRef %>"
+                                   target="_blank"
+                                   rel="noopener"
+                                   class="no-underline text-green hover:text-blue-dark">
+                                the NativeScript docs
+                                </a> for more information about <%= current.title %>.
+                            <% } %>
                             For more information about the available properties, methods, or events, head over
                             to <a href="<%= current.apiRef %>"
                                   target="_blank"