feat: edit and delete owned comments (Closes #575)

frontend/index.html

@@ -811,6 +811,7 @@
 <script src="static/later-picker.js"></script>
 <script src="static/pick-work.js"></script>
 <script src="static/conversation.js"></script>
+<script src="static/comment-actions.js"></script>
 <script src="static/issue-attachment.js"></script>
 <script src="static/issue-sheet.js"></script>
 <script src="static/create-issue-sheet.js"></script>