Add issue templates to try to route questions to Discussions

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report if you believe you've found a bug in this project; please use GitHub Discussions instead if you think the bug may be in your code.
+title: ''
+labels: bug
+assignees: ''
+
+---

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Help and support
+    url: https://github.com/zeux/pugixml/discussions
+    about: Please use GitHub Discussions if you have questions or need help.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---