doc: direct users to ask questions instead of raising issues

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -5,7 +5,11 @@ body:
   - type: markdown
     attributes:
       value: |
-        Before reporting: search [existing issues](https://github.com/kyazdani42/nvim-tree.lua/issues) and make sure that nvim-tree is updated to the latest version. If you are experiencing performance issues, please [enable profiling](https://github.com/kyazdani42/nvim-tree.lua#performance-issues) and attach the logs.
+        Is this a question?: Please start a new [Q&A discussion](https://github.com/kyazdani42/nvim-tree.lua/discussions/new) instead of raising a bug.
+        Before reporting:
+        * search [existing issues](https://github.com/kyazdani42/nvim-tree.lua/issues)
+        * ensure that nvim-tree is updated to the latest version
+        If you are experiencing performance issues, please [enable profiling](https://github.com/kyazdani42/nvim-tree.lua#performance-issues) and attach the logs.
   - type: textarea
     attributes:
       label: "Description"

.github/ISSUE_TEMPLATE/feature_request.md

@@ -6,6 +6,8 @@ labels: feature request
 assignees: ''
 
 ---
+**Is this a question?**
+Please start a new [Q&A discussion](https://github.com/kyazdani42/nvim-tree.lua/discussions/new) instead of raising a feature request.
 
 **Is your feature request related to a problem? Please describe.**
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]