[2021 - hashcode] add logo banner

Author: exoji2e

_events/2021-02-25-hashcode.md

@@ -1,8 +1,9 @@
 ---
-layout: events
+layout: event_small_title
 title: Hash Code 2021
 place: "Online"
 id: hashcode
+aboveimg: "/assets/images/2021/hashcode-logo.png"
 ---
 Code@LTH has organized a hub for the annual team programming competition Google Hash Code since 2016.
 
@@ -34,7 +35,7 @@ Remember to mark Code@LTH as your hub when you create your team on the judge sys
 - Find 3 friends (or fewer, teams of 2-4 are accepted).
 - Create your team on the judge-website that you get access to after sign up, and select Code@LTH as your hub.
 
-### Tips&Tricks
+## Tips & Tricks
 
 Hash code problems are similar to one an other. You best bet of doing well is to make sure to practice with your team!