Fix feed by not using pagination

I think this should resolve #330 but need to test it somehow.

docs/feed.md

@@ -16,18 +16,16 @@ To create a feed, add a file named `feed.njk` with the following content:
 eleventyExcludeFromCollections: true
 layout: feed
 permalink: /feed.xml
-pagination:
-  data: collections.post
-  size: 20
-  reverse: true
+collection: post
+size: 20
 ---
 ```
 
 The `permalink` value is the location of the generated feed.
 
 ## Create a collection of pages
 
-The feed will include all pages in the collection referenced by the `data` key of the `pagination` object.
+The feed will include pages in the collection referenced in the `collection` key, up to a maximum specified in `size`, with the newest first.
 
 You can create a collection by adding some code to your `eleventy.config.js`:
 

layouts/feed.njk

@@ -3,9 +3,9 @@
   <title>{{ options.homeKey }}</title>
   <link href="{{ permalink | canonicalUrl }}" rel="self"/>
   <link href="{{ options.url }}"/>
-  <updated>{{ collections.post | getNewestCollectionItemDate | dateToRfc3339 }}</updated>
+  <updated>{{ collections[collection] | getNewestCollectionItemDate | dateToRfc3339 }}</updated>
   <id>{{ options.url }}/</id>
-  {%- for item in pagination.items %}
+  {%- for item in (collections[collection] | sort(true, false, "date") | slice(size)) %}
   {%- set absolutePostUrl = item.url | canonicalUrl %}
   <entry>
     <title>{{ item.data.title }}</title>