Link to dedicated page from site head (#158)

- dedicated pages can be linked from landing area
- briefer version of that page can be included on the singe-page content

layouts/index.html

@@ -2,7 +2,7 @@
 {{ $headless := .Site.GetPage "/homepage" }}
 {{ $sections := $headless.Resources.ByType "page" }}
 {{ $sections := cond .Site.BuildDrafts $sections (where $sections "Draft" "==" false) }}
-{{ $content := where $sections "Params.external" "==" nil }}
+{{ $content := where (where $sections "Params.external" "==" nil) "Params.detailed_page_homepage_content" "ne" false }}
 
 <!-- Welcome screen that scrolls out of view -->
 {{ if not .Params.header_use_video }}
@@ -34,6 +34,8 @@
 
               {{ if isset .Params "external" }}
                  <a class='btn site-menu' href='{{ .Params.external }}'>{{ $button_title }}&nbsp;<icon class="fa fa-external-link"></icon></a>
+              {{ else if isset .Params "detailed_page_path" }}
+                 <a class='btn site-menu' href='{{ .Params.detailed_page_path }}'>{{ $button_title }}</a>
               {{ else }}
                 {{ $fnav_title := .Title }}{{ with .Params.navigation_menu_title }}{{ $fnav_title = . }}{{ end }}
                  <a class='btn site-menu' data-title-anchor='{{ anchorize $fnav_title }}' href='#{{ anchorize $fnav_title }}'>{{ $button_title }}</a>