Update posts files to track academic theme changes

content/home/posts.md

@@ -1,6 +1,6 @@
-+++
+++
 # Recent Posts widget.
-# Note: this widget will only display if `content/post/` contains posts.
+# This widget displays recent posts from `content/post/`.
 
 date = "2016-04-20T00:00:00"
 draft = false
@@ -12,8 +12,11 @@ widget = "posts"
 # Order that this section will appear in.
 weight = 70
 
-# Show posts that contain the following tags. Default to any tags.
-tags = []
+# Filter posts by tag.
+#  By default, show all recent posts.
+#  Filtering example: `tags_include = ["hugo", "academic"]`
+tags_include = []
+tags_exclude = []
 
 # Number of posts to list.
 count = 5