Update changelog

CHANGELOG.md

@@ -6,6 +6,7 @@
 - Added "back to top" links to activity pages
 - Make slot start field non-nullable to simplify code
 - Added planning caption
+- Added planning PDF upload and download
 
 ## Version 1.2.1 - 2021-04-24
 

home/templates/_planning.html

-<div id="planning" style="margin-left: calc(-48vw + 50%); width: 96vw; background-color: white; padding: 10px;"></div>
+<div id="planning" style="margin-left: calc(-49vw + 50%); width: 96vw; background-color: white; padding: 10px;"></div>
 <!--
 In order to limit the planning's width, we cheat using the timeline's groups
 I.E we set all dates to the first day (Friday) and set groups allowing vertical display: