Add issue templates: experience report, bug, docs, blank issue

.github/ISSUE_TEMPLATE/1-experience-report.yml

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+name: '🧪 Experience report'
+description: 'Share your experience using JupyterGIS; anything goes.'
+labels:
+  - 'experience report'
+body:
+  - type: 'textarea'
+    attributes:
+      label: 'Description'
+      description: |
+        Please describe your experience clearly.
+        We'd love to hear where you experienced friction, unintuitive behavior, or joy when using JupyterGIS.
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/2-bug.yml

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+name: '🐞 Bug'
+description: 'Any behavior that is unexpected or differs from the documentation.'
+labels:
+  - 'bug'
+body:
+  ## Excluded for now; we're not really seeing a ton of duplicate issue
+  ## reports, and I'd love to make reporting as approachable as possible.
+  # - type: "checkboxes"
+  #   attributes:
+  #     label: "Is there an existing issue for this?"
+  #     description: |
+  #       Please [:mag: search for existing issues](https://github.com/geojupyter/jupytergis/issues?q=sort%3Aupdated-desc%20is%3Aissue)
+  #       to see if this has already been reported.
+  #     options:
+  #       - label: "I've searched existing issues"
+  #         required: true
+
+  - type: 'input'
+    attributes:
+      label: 'JupyterGIS version'
+      description: |
+        In which version of JupyterGIS does this issue occur?
+        You can find this information on the status bar at the bottom of the JupyterGIS window.
+      validations:
+        required: false
+
+  - type: 'textarea'
+    attributes:
+      label: 'Description'
+      description: |
+        Please describe the issue clearly.
+        For best results, include a reproducible example or a screenshot/video of the issue.
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/3-docs.yml

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+name: '📃 Documentation'
+description: 'Anything that could be improved about our documentation.'
+labels:
+  - 'documentation'
+body:
+  ## Excluded for now; we're not really seeing a ton of duplicate issue
+  ## reports, and I'd love to make reporting as approachable as possible.
+  # - type: "checkboxes"
+  #   attributes:
+  #     label: "Is there an existing issue for this?"
+  #     description: |
+  #       Please [:mag: search for existing issues](https://github.com/geojupyter/jupytergis/issues?q=sort%3Aupdated-desc%20is%3Aissue)
+  #       to see if this has already been reported.
+  #     options:
+  #       - label: "I've searched existing issues"
+  #         required: true
+
+  - type: 'textarea'
+    attributes:
+      label: 'Description'
+      description: |
+        Please describe the issue clearly.
+        If you're reporting an issue with an existing page, please link to it.
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: '🌟 Community support'
+    url: 'https://jupyter.zulipchat.com/#narrow/channel/471314-geojupyter'
+    about: 'Explore our open Zulip chat to ask questions, share insights, and connect with other JupyterGIS users.'