Update the feeds.js to work with mixin rss.xml

[rosy1280]

The pattern library was updated in November 2019 to accept wordpress feed content on the homepage.

Currently the Scholar Blog's site used on the homepage only contains broad content, not content from all libraries. To make sure that we are pulling in content from other blogs, a mixin was created to incorporate content from all blogs. Unfortunately it appears that feed.js doesn't know how to parse the content.

To fix this issue there are number of options available to us:

1. All libraries use the same blog to post content for their website.
2. Development occur to update feed.js to take in xml feeds, not just json feeds.
3. We get a mixin that outputs .json feeds
4. Content is posted in both blogs.
5. We acknowledge that not all content appears on the homepage and wait until we can feasibly implement one of the above options

[rosy1280]

checking to see if this is solved by method #3