Use a label, not an epic, to track CoreContributor work [MNG-2720]
Per https://forum.opencraft.com/t/updated-core-contributor-workflow-in-jira/1209/7 , this updates our handbook and bookmarklet to use a label not an epic.
Per https://forum.opencraft.com/t/updated-core-contributor-workflow-in-jira/1209/7 , this updates our handbook and bookmarklet to use a label not an epic.