Add shared workflows

.github/ISSUE_TEMPLATE/bug.yml

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+name: "Bug report"
+description: Report an unexpected problem or unintended behavior.
+labels: ["needs triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        ### Before you start
+
+        **Want to fix the problem yourself?** This project is open source and we welcome fixes and improvements from the community!
+
+        ↩ Check the project [CONTRIBUTING.md](../blob/main/CONTRIBUTING.md) guide to see how to get started.
+
+        ---
+  - type: textarea
+    id: problem
+    attributes:
+      label: What information was incorrect, unhelpful, or incomplete?
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: What did you expect to see?
+    validations:
+      required: true
+  - type: textarea
+    id: references
+    attributes:
+      label: Do you have any supporting links, references, or citations?
+      description: Link to information that helps us confirm your issue.
+  - type: textarea
+    id: more-info
+    attributes:
+      label: Do you have anything more you want to share?
+      description: For example, steps to reproduce a bug, screenshots, screen recordings, or sample code

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: MDN GitHub Discussions
+    url: https://github.com/orgs/mdn/discussions
+    about: Does the issue involve a lot of pages, or are you not sure how it can be split into actionable tasks? Consider starting a discussion first.
+  - name: MDN Web Docs on Discourse
+    url: https://discourse.mozilla.org/c/mdn/learn/250
+    about: Need help with assessments on MDN Web Docs? We have a support community for this purpose on Discourse.
+  - name: Help with code
+    url: https://stackoverflow.com/
+    about: If you are stuck and need help with code, StackOverflow is a great resource.