Add issue and discussion templates for documentation improvements

.github/DISCUSSION_TEMPLATE/docs-suggestions.yml

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+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for getting in touch! Please fill out this form as completely as possible.
+
+        Want to report a problem with the Starlight docs? [Open a new issue](https://github.com/withastro/starlight/issues/new?assignees=&labels=&projects=&template=---02-docs-issue.yml)
+        Want to chat before posting? [Join us in the `#starlight` channel on Discord](https://astro.build/chat)
+  - type: textarea
+    id: summary
+    attributes:
+      label: What is your idea?
+      description: A brief, one or two sentence description of your idea for how to improve the Starlight docs.
+    validations:
+      required: true
+  - type: textarea
+    id: background
+    attributes:
+      label: Why is this important?
+      description: Explain why this idea is valuable. What problems would it solve? Which users would it help?
+    validations:
+      required: true
+  - type: textarea
+    id: prior-art
+    attributes:
+      label: How does your idea relate to existing docs content?
+      description: Are there specific pages you would like to change? Or existing pages that are related to your proposal?
+      placeholder: |
+        - Example
+        - Example
+        - Example
+  - type: checkboxes
+    id: will-pr
+    attributes:
+      label: Participation
+      description: Let us know if your interested in contributing this feature yourself.
+      options:
+        - label: I am willing to submit a pull request for this feature.
+          required: false

.github/ISSUE_TEMPLATE/---02-docs-issue.yml

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+name: "\U0001F4DA Docs Issue"
+description: Report an issue with the Starlight documentation
+labels: []
+assignees: []
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to let us know something is wrong! Please fill out this form as completely as possible.
+  - type: input
+    id: docs-page
+    attributes:
+      label: What page of the docs did you find an issue on?
+      description: If this issue applies to multiple pages, include additional pages in your bug description.
+      placeholder: https://starlight.astro.build/...
+    validations:
+      required: true
+  - type: textarea
+    id: bug-description
+    attributes:
+      label: Describe the issue
+      description: A clear and concise description of what the issue is.
+    validations:
+      required: true
+  - type: input
+    id: os
+    attributes:
+      label: What operating system are you using?
+      placeholder: Mac, Windows, Linux
+    validations:
+      required: true
+  - type: input
+    id: browser
+    attributes:
+      label: What browser are you using?
+      placeholder: Chrome, Firefox, Safari
+    validations:
+      required: true
+  - type: checkboxes
+    id: will-pr
+    attributes:
+      label: Participation
+      options:
+        - label: I am willing to submit a pull request for this issue.
+          required: false