Make texts uniform and add unicode characters

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,5 +1,5 @@
-name: Bug Report
-description: File a bug report
+name: 🐛 File a bug report
+description: X's behavior is deviating from its documented behavior.
 labels: ["bug"]
 body:
   - type: markdown

.github/ISSUE_TEMPLATE/config.yml

@@ -1,12 +1,11 @@
 blank_issues_enabled: true
 contact_links:
-  - name: I want to discuss something on gitter
+  - name: ✨ Propose a new major feature
+    url: https://github.com/zarr-developers/zarr-specs
+    about: A new major feature should be discussed in the Zarr specifications repository.
+  - name: ❓ Discuss something on gitter
     url: https://gitter.im/zarr-developers/community
     about: For questions like "How do I do X with Zarr?", you can move to our Gitter channel.
-  - name: I want to discuss something on GitHub Discussions 
+  - name: ❓ Discuss something on GitHub Discussions 
     url: https://github.com/zarr-developers/zarr-python/discussions
     about: For questions like "How do I do X with Zarr?", you can move to GitHub Discussions.
-  - name: I want to propose a new major feature major
-    url: https://github.com/zarr-developers/zarr-specs
-    about: |
-      A new major feature should be discussed in the Zarr specifications repository.