Add back green box link to CJ 9 page

This was the easiest way of navigating to the CJ9 page previously other than the home page. Let's keep it for the duration of the jam

Author: minalike

pydis_site/templates/events/index.html

@@ -9,6 +9,9 @@
 {% block event_content %}
     <div class="box">
         <h2 class="title is-4"><a href="{% url "events:page" path="code-jams" %}">Code Jams</a></h2>
+        <div class="notification is-success">
+            <a href="{% url "events:page" path="code-jams/9" %}">The <b>2022 Summer Code Jam</b> is underway!</a>.
+          </div>
         <p>Every year we hold a community-wide Summer Code Jam. For this event, members of our community are assigned to teams to collaborate and create something amazing using a technology we picked for them. One such technology that was picked for the Summer 2021 Code Jam was text user interfaces (TUIs), where teams could pick from a pre-approved list of frameworks.</p>
         <p>To help fuel the creative process, we provide a specific theme, like <strong>Think Inside the Box</strong> or <strong>Early Internet</strong>. At the end of the Code Jam, the projects are judged by Python Discord server staff members and guest judges from the larger Python community. The judges will consider creativity, code quality, teamwork, and adherence to the theme.</p>
         <p>If you want to read more about Code Jams, visit our <a href="{% url "events:page" path="code-jams" %}">Code Jam info page</a> or watch this video showcasing the best projects created during the <strong>Winter Code Jam 2020: Ancient Technology</strong>:</p>