feat: add issue templates

.github/ISSUE_TEMPLATE/bug-report.yaml

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+name: Bug Report
+description: Report an issue with Headplane
+assignees: [tale]
+labels: [bug, triage]
+body:
+    - type: input
+      attributes:
+          label: Title
+          description: A short summary of the issue
+          placeholder: e.g. "Error when uploading a file"
+      validations:
+          required: true
+    - type: textarea
+      attributes:
+          label: Description
+          description: |
+              A detailed description of the issue and steps to reproduce it.
+              If applicable, include any error messages or screenshots.
+
+              If this is not an issue with Headplane, but an issue with your
+              environment, please consider opening a discussion instead.
+          placeholder: e.g. "When I try to upload a file, I get an error message."
+      validations:
+          required: true
+    - type: input
+      attributes:
+          label: Headplane Version
+          description: What version of Headplane are you using?
+          placeholder: e.g. "v0.5.5"
+      validations:
+          required: true
+    - type: input
+      attributes:
+          label: Headscale Version
+          description: What version of Headscale are you using?
+          placeholder: e.g. "v0.25.1"
+      validations:
+          required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature-request.yaml

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+name: Feature Request
+description: Request a new feature or enhancement for Headplane
+assignees: [tale]
+labels: [enhancement, triage]
+body:
+    - type: input
+      attributes:
+          label: Title
+          description: A short summary of the enhancement you are requesting.
+          placeholder: e.g. "Add support for custom themes"
+      validations:
+          required: true
+    - type: textarea
+      attributes:
+          label: Description
+          description: |
+              A detailed description of the feature you would like to see added.
+              Please include any relevant context, such as why this feature is
+              important and how it would benefit other users beyond yourself.
+          placeholder: e.g. "I would like to see support for custom themes in Headplane so that I can personalize the interface to my liking."
+      validations:
+          required: true