Fix HTML validation errors

Author: jasongrout

community.md

@@ -95,8 +95,7 @@ This page is for in-person, one-of-a-kind events; for community engagement, see
 This is a calendar of regular online events.  It might not be exhaustive.
 
 <div class="iframe-container">
-  <iframe title="Calendar of Project Jupyter events" class="responsive-iframe" id="calendariframe" src="https://calendar.google.com/calendar/embed?height=600&
-wkst=1&title=Project%20Jupyter&showPrint=0&src=bTNoZWs2OWRhZzczODF1bXQ4a2NqZDc1dTRAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ&src=Y184YWIxNzY1YjY1ODY3NDVkOGI3NWU5MmJkYzdjYTZlNDZjYWExMmE1ZjhkOTUwZDVmNzNmMzI2Zjk3NjE0NGQ3QGdyb3VwLmNhbGVuZGFyLmdvb2dsZS5jb20&src=YXFwa3VpNXE3b2kzMnBrOXRjcDUzaG5zc2NAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ&color=%23AD1457&color=%239E69AF&color=%23616161" style="border-width:0" width="800" height="600" frameborder="0" scrolling="no"></iframe>
+  <iframe title="Calendar of Project Jupyter events" class="responsive-iframe" id="calendariframe" src="https://calendar.google.com/calendar/embed?height=600&wkst=1&title=Project%20Jupyter&showPrint=0&src=bTNoZWs2OWRhZzczODF1bXQ4a2NqZDc1dTRAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ&src=Y184YWIxNzY1YjY1ODY3NDVkOGI3NWU5MmJkYzdjYTZlNDZjYWExMmE1ZjhkOTUwZDVmNzNmMzI2Zjk3NjE0NGQ3QGdyb3VwLmNhbGVuZGFyLmdvb2dsZS5jb20&src=YXFwa3VpNXE3b2kzMnBrOXRjcDUzaG5zc2NAZ3JvdXAuY2FsZW5kYXIuZ29vZ2xlLmNvbQ&color=%23AD1457&color=%239E69AF&color=%23616161" style="border:0;overflow:hidden" width="800" height="600"></iframe>
 </div>
 <script>document.getElementById("calendariframe").src = document.getElementById("calendariframe").src.replace("ctz=local", "ctz=" + Intl.DateTimeFormat().resolvedOptions().timeZone)</script>