chore(admin): Add issue forms

.github/ISSUE_TEMPLATE/report-a-bug.yaml

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+name: Report a bug
+description: Report a bug
+labels: ['bug', 'triage']
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to submit this bug report.
+  - type: dropdown
+    id: have-checked-latest
+    attributes:
+      label: Have you checked that the bug is not already fixed?
+      description: 'Please make sure you have checked that the latest version of markdown-link-check includes the bug you are reporting.'
+      options:
+        - 'Yes'
+        - 'No'
+    validations:
+      required: true
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: Please provide a concise summary of the bug.
+    validations:
+      required: true
+  - type: input
+    id: affected-version
+    attributes:
+      label: Affected version
+      description: 'Please provide the version markdown-link-check used.'
+    validations:
+      required: true
+  - type: textarea
+    id: steps-to-reproduce
+    attributes:
+      label: Steps to reproduce the bug
+      description: 'Please provide detailed step-by-step instructions on how to replicate this issue, including any relevant configuration.'
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behaviour
+    attributes:
+      label: Expected behavior
+      description: 'Please provide a clear and concise description of the expected behaviour.'
+    validations:
+      required: true
+  - type: textarea
+    id: actual-behaviour
+    attributes:
+      label: Actual behavior
+      description: 'Please provide a clear and concise description of the actual behaviour.'
+    validations:
+      required: true
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: 'Please provide any additional context or information that may be helpful in diagnosing and resolving this issue.'
+  - type: dropdown
+    id: could-submit-pull-request
+    attributes:
+      label: Can you fix it?
+      description: 'Would you be willing and/or able to submit a pull request to fix the bug?'
+      options:
+        - 'Yes'
+        - 'No'
+        - 'Maybe'
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/request-an-enhancement.yaml

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+name: Request an enhancement
+description: Request an enhancement
+labels: ['enhancement', 'triage']
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to share your suggestion for enhancing markdown-link-check.
+  - type: dropdown
+    id: have-checked-latest
+    attributes:
+      label: Have you checked that the enhancement does not already exist?
+      description: 'Please make sure you have checked that the latest version of markdown-link-check does not already support the behaviour you are suggesting.'
+      options:
+        - 'Yes'
+        - 'No'
+    validations:
+      required: true
+  - type: textarea
+    id: summary
+    attributes:
+      label: Summary
+      description: 'Please provide a clear and concise description of the suggested enhancement.'
+    validations:
+      required: true
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: 'Please provide any additional context or information that may be helpful in understanding the motivation behind your suggestion.'
+  - type: dropdown
+    id: could-submit-pull-request
+    attributes:
+      label: Could you implement the enhancement?
+      description: 'Would you be willing and/or able to submit a pull request to add the enhancement?'
+      options:
+        - 'Yes'
+        - 'No'
+        - 'Maybe'
+    validations:
+      required: true