Update index.md

Author: cubap

pages/index.md

@@ -21,7 +21,7 @@ Open an account to start recording annotations on images from all over the world
 {: .authenticated.hidden}
 Welcome back! [Launch TPEN 3.0](https://app.t-pen.org){: .button role="button"}
 
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+<hr>
 
 {%- assign pinned_posts = site.posts | where: "pinned", true -%}
 {%- assign posts_to_show = pinned_posts -%}