Add issue templates

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: ❓ Simple question - Discord chat
+    url: https://discord.com/invite/flarenetwork
+    about: This issue tracker is not for technical support. Please use the Discord chat, and ask the community for help.

.github/ISSUE_TEMPLATE/documentation.yml

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+name: Documentation
+description: Report an issue related to documentation
+labels: [documentation]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        This template is strictly used for issues with documentation, including:
+
+        - Documenting undocumented APIs;
+        - Updating external links;
+
+        You can proceed directly to sending a pull request without filing this issue, and we can improve on your work.
+        If you think some of the requirements above are not met, or if you are not able to contribute yourself, the issue is still welcomed.
+
+  - type: textarea
+    attributes:
+      label: Description
+      description: A clear and concise description of what the issue is.
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature Request
+description: Submit a feature request for the documentation
+labels: [feature]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        This template is strictly used for feature requests, including:
+
+        - Requesting a new guide or tutorial;
+        - Requesting elaboration on a particular topic;
+
+  - type: textarea
+    attributes:
+      label: Description
+      description: A clear and concise description of what the feature is.
+    validations:
+      required: true