Add media redirect for feature images as well

Be careful with profile-pics though!

src/templates/post.js

@@ -30,7 +30,7 @@ const Post = ({ data, location }) => {
                 <Layout hasFeatureImage={ post.feature_image }>
                 { post.feature_image ?
                     <figure className="post-feature-image">
-                        <img src={ post.feature_image } alt={ post.title } />
+                        <img src={ post.feature_image.replace(new RegExp(config.mediaUrlFrom, 'g'), config.mediaUrlTo) } alt={ post.title } />
                     </figure> : null }
                     <div className="container">
                         <article className="content">