Improve issue templates chooser. (#1821)

Add issue templates to improve triage and issue quality.

https://docs.github.com/en/github/building-a-strong-community/configuring-issue-templates-for-your-repository

Author: ldez

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Questions
+    url: https://github.com/golangci/golangci-lint/discussions
+    about: If you have a question, or are looking for advice, please post on our discussions forum!
+  - name: golangci-lint documentation
+    url: https://golangci-lint.run
+    about: Please take a look to our documenation.