chore: update issue templates

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug report
+description: Create a report to help us improve
+labels: [bug]
+assignees: [kmnhan]
+body:
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: |
+        Thanks for reporting a bug! Please describe what you were trying to get done.
+        Tell us what happened, what went wrong.
+    validations:
+      required: true
+
+  - type: textarea
+    id: what-did-you-expect-to-happen
+    attributes:
+      label: What did you expect to happen?
+      description: |
+        A clear and concise description of what you expected to happen.
+    validations:
+      required: false
+
+  - type: textarea
+    id: sample-code
+    attributes:
+      label: Minimal Complete Verifiable Example
+      description: |
+        Minimal, self-contained copy-pastable example that demonstrates the issue.         This will be automatically formatted into code, so no need for markdown backticks.
+      render: Python
+
+  - type: checkboxes
+    id: mvce-checkboxes
+    attributes:
+      label: MVCE confirmation
+      description: |
+        Please confirm that the bug report is in an excellent state, so we can understand & fix it quickly & efficiently. For more details, check out:
+
+        - [Minimal Complete Verifiable Examples](https://stackoverflow.com/help/mcve)
+        - [Craft Minimal Bug Reports](https://matthewrocklin.com/minimal-bug-reports)
+
+      options:
+        - label: Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue.
+        - label: Complete example — the example is self-contained, including all data and the text of any traceback.
+        - label: Verifiable example — the example copy & pastes into an IPython prompt, returning the result.
+        - label: New issue — a search of GitHub Issues suggests this is not a duplicate.
+        - label: Recent environment — the issue occurs with the latest version of erlab and its dependencies.
+
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: |
+        Add any other context about the problem here, including screenshots or a list of packages and versions installed if relevant.

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: Feature Request
+description: Suggest an idea for this project
+labels: [enhancement]
+assignees: [kmnhan]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Is your feature request related to a problem? Please describe.
+      description: |
+        A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the solution you'd like
+      description: |
+        A clear and concise description of what you want to happen.
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Describe alternatives you've considered
+      description: |
+        A clear and concise description of any alternative solutions or features you've 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