Change label for stale bot (#7429)

* Change label for stale bot

* Reword things to be more concise and clear

* git add .  -- that's how this works, right?

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* Remove Discussion label from issue templates

.github/ISSUE_TEMPLATE/bug_report.md

@@ -2,7 +2,7 @@
 name: Bug report
 about: Create a report to help us improve QMK Firmware.
 title: "[Bug] "
-labels: bug, help wanted, discussion
+labels: bug, help wanted
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/feature_request.md

@@ -2,7 +2,7 @@
 name: Feature request
 about: Suggest a new feature or changes to existing features.
 title: "[Feature Request] "
-labels: enhancement, help wanted, discussion
+labels: enhancement, help wanted
 assignees: ''
 
 ---

.github/ISSUE_TEMPLATE/other_issues.md

@@ -2,7 +2,7 @@
 name: Other issues
 about: Anything else that doesn't fall into the above categories.
 title: ''
-labels: help wanted, question, discussion
+labels: help wanted, question
 assignees: ''
 
 ---