Move preamble include from layout to content file.

Author: YoRyan

_includes/program/all_preambles.html

@@ -0,0 +1,3 @@
+{%- for preamble in page.preambles -%}
+{%- include program/preamble.html modal=preamble.modal title=preamble.title file=preamble.file -%}
+{%- endfor -%}

_layouts/default.html

@@ -27,6 +27,8 @@ <h1>{{ page.title }}</h1>
 
     </div>
 
+    {%- include program/all_preambles.html -%}
+
   </body>
 
 </html>

_layouts/homepage.html

@@ -29,7 +29,7 @@
 
     </div>
 
-    {%- include program/preamble.html modal="modal1" title="Download Open Rails" file="stable_installer" -%}
+    {%- include program/all_preambles.html -%}
 
     <!-- Modal -->
     <style>

index.html

@@ -1,6 +1,10 @@
 ---
 layout: homepage
 title: Open Rails - Free train simulator project
+preambles:
+  - modal: modal1
+    title: Download Open Rails
+    file: stable_installer
 ---
 
 <div class="row">