Fixed some typos

Author: dphuang2

_includes/posts.html

@@ -9,7 +9,7 @@
         {% endfor %}
         <h2 class="preview__header" itemprop="name">{{ post.title }}</h2>
         <div class="post-image-wrapper">
-          <picture class="post-image">>
+          <picture class="post-image">
             <source srcset="{{post.image_webp}}" type="image/webp">
             <source srcset="{{post.image}}" type="image/jpeg"> 
             <img class="post-image" src="{{post.image}}" alt="Alt Text!">

_posts/2018-09-20-self-analysis.markdown

@@ -5,7 +5,7 @@ date: 2018-9-20
 description: 
 location: University of Illinois at Urbana–Champaign
 image: /assets/image/self-analysis.jpg
-image-webp: /assets/image/webp/self-analysis.webp
+image_webp: /assets/image/webp/self-analysis.webp
 ---
 
 # Why and How?