Deleted the checkboxes in favour of using labels

Author: kelvinlauKL

.github/ISSUE_TEMPLATE.md

@@ -1,13 +1,7 @@
-### Category
-
-- [ ] Bug
-- [ ] Feature Request
-- [ ] Question
-
 ### Brief Intro
 
 <!-- Describe the issue briefly.-->
 
 ### More Details
 
-<!-- If necessary, start off with the code snippet. Put the code in between ``` to format them into code blocks.-->
+<!-- If necessary, start off with the code snippet. Put the code in between ``` to format them into code blocks.-->