chore: add issue/PR templates (#1531)

Co-authored-by: Daniel Roe <daniel@roe.dev>

Author: colinscz

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: "\U0001F41E Bug report"
+description: Create a report to help us improve npmx
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please carefully read the contribution docs before creating a bug report
+        👉 https://github.com/npmx-dev/npmx.dev/blob/main/CONTRIBUTING.md
+  - type: textarea
+    id: bug-description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is. If you intend to submit a PR for this issue, tell us in the description. Thanks!
+      placeholder: Bug description
+    validations:
+      required: true
+  - type: textarea
+    id: additional
+    attributes:
+      label: Additional context
+      description: If applicable, add any other context about the problem here
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs
+      description: |
+        Optional if you have reproduction steps. Please try not to insert an image but copy paste the log text.
+      render: shell-script

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: 📚 npmx documentation
+    url: https://docs.npmx.dev/
+    about: Check the documentation for usage of Npmx

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: '🚀 Feature request'
+description: Suggest a feature that will improve Npmx
+labels: ['pending triage']
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to fill out this feature request!
+
+          Please carefully read the contribution docs before suggesting a new feature
+          👉 https://github.com/npmx-dev/npmx.dev/blob/main/CONTRIBUTING.md
+  - type: textarea
+    id: feature-description
+    attributes:
+      label: Describe the feature
+      description: A clear and concise description of what you think would be a helpful addition to Npmx, including the possible use cases and alternatives you have considered. If you have a working prototype or module that implements it, please include a link.
+      placeholder: Feature description
+    validations:
+      required: true
+  - type: checkboxes
+    id: additional-info
+    attributes:
+      label: Additional information
+      description: Additional information that helps us decide how to proceed.
+      options:
+        - label: Would you be willing to help implement this feature?
+  - type: checkboxes
+    id: required-info
+    attributes:
+      label: Final checks
+      description: Before submitting, please make sure you do the following
+      options:
+        - label: Read the [contribution guide](https://github.com/npmx-dev/npmx.dev/blob/main/CONTRIBUTING.md).
+          required: true
+        - label: Check existing [issues](https://github.com/npmx-dev/npmx.dev/issues).
+          required: true

.github/PULL_REQUEST_TEMPLATE.md

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+### 🔗 Linked issue
+
+<!-- Please ensure there is an open issue and mention its number. For example, "resolves #123" -->
+
+### 🧭 Context
+
+<!-- Brief background and why this change is needed -->
+
+<!-- High-level summary of what changed -->
+
+### 📚 Description
+
+<!-- Describe your changes in detail. Why is this change required? What problem does it solve? -->
+
+<!-- If you used AI tools to help with this contribution, please ensure the PR description and code reflect your own understanding.
+     Write in your own voice rather than copying AI-generated text. -->
+
+<!----------------------------------------------------------------------
+Before creating the pull request, please make sure you do the following:
+
+- Check that there isn't already a PR that solves the problem the same way. If you find a duplicate, please help us reviewing it.
+- Ensure that PR title follows conventional commits (https://www.conventionalcommits.org)
+- Update the corresponding documentation if needed.
+- Include relevant tests that fail without this PR but pass with it.
+- Add any additional context, tradeoffs, follow-ups, or things reviewers should be aware of.
+
+Thank you for contributing to Npmx!
+----------------------------------------------------------------------->