Improves issue templates

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: 🐛 Bug report
+description: Create a report to help fix a problem in EqualsVerifier.
+title: '[Bug] '
+body:
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is.
+    validations:
+      required: true
+
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Steps to reproduce
+      description: Explain what you did to run into this issue.
+
+  - type: textarea
+    id: error-message
+    attributes:
+      label: Error message and version number
+      description: The error message that EqualsVerifier produces. Include the version number, and if possible the stack trace too.
+
+  - type: textarea
+    id: code-equalsverifier
+    attributes:
+      label: "Code: EqualsVerifier invocation"
+      description: The code that you used to call EqualsVerifier.
+
+  - type: textarea
+    id: code-class-under-test
+    attributes:
+      label: "Code: class under test"
+      description: The class that you're testing. If you can't share the code due to confidentiality, please anonymize the code.
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Any other information you would like to share.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 📜 Error messages explained
+    url: https://jqno.nl/equalsverifier/errormessages/
+    about: You can check here if your problem already has a solution.
+  - name: 📚 Manual
+    url: https://jqno.nl/equalsverifier/manual/
+    about: You can check here how certain features are supposed to work.

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: 💡 Feature request
+description: Suggest an idea to improve EqualsVerifier.
+title: '[Feature] '
+body:
+
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the feature
+      description: A clear and concise description of what the feature should do.
+    validations:
+      required: true
+
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the solution you'd like
+      description: Please tell me how you prefer to see this feature implemented.
+
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Describe alternatives
+      description: Are there alternative solutions you have considered?
+
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      description: Any other information you would like to share.