adds rss.json file, moves some meta-data out into meta file for consolidation (#649)

_data/meta.yml

@@ -0,0 +1,2 @@
+title: Godot Engine Official
+description: Godot is a 2D and 3D free and open source game engine developed by a community of contributors. It provides a huge set of common tools, so you can just focus on making your game without reinventing the wheel.

pages/rss.json

@@ -0,0 +1,23 @@
+---
+permalink: /rss.json
+---
+
+{
+	"title": "{{ site.data.meta.title }}",
+	"description": "{{ site.data.meta.description }}",
+	"items": [
+	{% assign latest_posts = site.article | sort:"date" | reverse %}
+		{% for post in latest_posts limit:24 %}
+		{
+			"title": "{{ post.title | escape }}",
+			"link": "{{ site.url }}{{ post.url }}",
+			"description": "{{ post.excerpt | escape }}",
+			"categories": [{% for category in post.categories %}"{{ site.data.categories[category][0].name }}"{% unless forloop.last %},{% endunless %}{% endfor %}],
+			"guid": "{{ site.url }}{{ post.url }}",
+			"dc:creator": "{{ post.author | escape }}",
+			"pubDate": "{{ post.date | date: "%a, %d %b %Y %X +0000" }}",
+			"image": "{{ site.url }}{{ post.image }}"
+		}{% unless forloop.last %},{% endunless %}
+		{% endfor %}
+	]
+}

pages/rss.xml

@@ -6,9 +6,9 @@ permalink: /rss.xml
 <rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/">
 	<channel>
 
-	<title>Godot Engine Official</title>
-	<link>{{ site.url }}</link>
-	<description>Godot is a 2D and 3D free and open source game engine developed by a community of contributors. It provides a huge set of common tools, so you can just focus on making your game without reinventing the wheel.</description>
+	<title>{{ site.data.meta.title }}</title>
+	<link>{{ site.meta.url }}</link>
+	<description>{{ site.data.description }}</description>
 	<atom:link href="{{ site.url }}/rss.xml" rel="self" type="application/rss+xml" />
 
 	{% assign latest_posts = site.article | sort:"date" | reverse %}