Remove position: sticky JavaScript polyfill

- Fallback to default positioning for browser that don't support it IE, Chrome < 56, etc.
- Issue #752

docs/_pages/about.md

@@ -12,7 +12,7 @@ layouts_gallery:
   - url: /assets/images/mm-layout-archive.png
     image_path: /assets/images/mm-layout-archive.png
     alt: "archive layout example"
-modified: 2016-11-03T11:55:22-04:00
+modified: 2017-01-05T11:46:07-05:00
 ---
 
 Minimal Mistakes is a flexible two-column Jekyll theme. Perfect for hosting your personal site, blog, or portfolio on GitHub or self-hosting on your own server. As the name implies --- styling is purposely minimalistic to be enhanced and customized by you :smile:.
@@ -75,7 +75,6 @@ For even more demo pages check the [posts archive][year-archive].
 - [FitVids.JS](http://fitvidsjs.com/)
 - Greedy Navigation - [lukejacksonn](http://codepen.io/lukejacksonn/pen/PwmwWV)
 - [jQuery Smooth Scroll](https://github.com/kswedberg/jquery-smooth-scroll)
-- [Stickyfill](https://github.com/wilddeer/stickyfill)
 
 ---