Github templates add support question and documentation issue (#10613)

.github/ISSUE_TEMPLATE/2_Feature_request.md

@@ -1,5 +1,5 @@
 ---
-name: Feature request
+name: 🚀 Feature Request
 about: Suggest an idea for this project
 
 ---

.github/ISSUE_TEMPLATE/3_Support_question.md

@@ -0,0 +1,10 @@
+---
+name: ⛔ Support Question
+about: See [PX4 Discuss](http://discuss.px4.io/) for questions about using PX4.
+
+---
+
+We use GitHub issues only to discuss PX4 bugs and new features. For
+questions about using PX4 or related components, please use [PX4 Discuss](http://discuss.px4.io/).
+
+Thanks!

.github/ISSUE_TEMPLATE/4_Documentation_issue.md

@@ -0,0 +1,9 @@
+---
+name: ⛔ Documentation Issue
+about: See https://github.com/PX4/Devguide for documentation issues
+
+---
+
+PX4 has dedicated repositories for developer documentation (https://github.com/PX4/Devguide) and user documentation (https://github.com/PX4/px4_user_guide).
+
+Thanks!