Infra: Use GitHub issue forms

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: "Bug report"
+description: Create a report to help us improve the Python devguide
+title: "Bug: <title>"
+labels: ["bug"]
+assignees: []
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        > [!NOTE]
+        > This repo is for the [Python devguide](https://devguide.python.org/).
+        > If you are reporting a bug for the Python language or
+        > CPython interpreter, then use the
+        > [CPython issue tracker](https://github.com/python/cpython/issues) instead.
+
+  - type: textarea
+    id: bug_description
+    attributes:
+      label: "Describe the bug"
+      description: A clear and concise description of what the bug is.
+    validations:
+      required: true
+
+  - type: textarea
+    id: expected_behavior
+    attributes:
+      label: "Expected behavior"
+      description: A clear and concise description of what you expected to happen.
+    validations:
+      required: true
+
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: "Screenshots"
+      description: If applicable, add screenshots to help explain your problem.
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional_context
+    attributes:
+      label: "Additional context"
+      description: Add any other context about the problem here.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: "Feature request"
+description: Suggest an idea for the Python devguide
+title: "Feature: <title>"
+labels: ["enhancement"]
+assignees: []
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        > [!NOTE]
+        > This repo is for the [Python devguide](https://devguide.python.org/).
+        > If you are requesting an enhancement for the Python language or
+        > CPython interpreter, then use the
+        > [CPython issue tracker](https://github.com/python/cpython/issues) instead.
+
+  - type: textarea
+    id: feature_description
+    attributes:
+      label: "Describe the enhancement or feature you would like"
+      description: A clear and concise description of what you want to happen.
+    validations:
+      required: true
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: "Describe alternatives you have considered"
+      description: A clear and concise description of any alternative solutions or features you have considered.
+    validations:
+      required: false
+
+  - type: textarea
+    id: additional_context
+    attributes:
+      label: "Additional context"
+      description: Add any other context or screenshots about the feature request here.
+    validations:
+      required: false