Replace Markdown issue template with YAML issue forms

.github/ISSUE_TEMPLATE/Bug_report.yml

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+name: 🐛 Bug report
+description: Something does not work the way we promised
+labels:
+  - bug
+body:
+  - type: checkboxes
+    attributes:
+      label: Before you start - checklist
+      options:
+        - label: I followed instructions in documentation written for my React-PDF version
+          required: true
+        - label: I have checked if this bug is not already reported
+          required: true
+        - label: I have checked if an issue is not listed in [Known issues](https://github.com/wojtekmaj/react-pdf/wiki/Known-issues)
+          required: true
+        - label: If I have a problem with PDF rendering, I checked if my PDF renders properly in [PDF.js demo](https://mozilla.github.io/pdf.js/web/viewer.html)
+  - type: textarea
+    attributes:
+      label: Description
+      description: Short description of the bug you encountered.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Steps to reproduce
+      description: |
+        Steps to reproduce the behavior.
+
+        Example:
+          1. Go to '…'
+          2. Click on '…'
+          3. Scroll down to '…'
+          4. See error
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Expected behavior
+      description: What is the expected behavior?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Actual behavior
+      description: What is the actual behavior?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: If applicable, add screenshots (preferably with browser console open) and files you have an issue with to help explain your problem.
+  - type: textarea
+    attributes:
+      label: Environment
+      description: |
+        Example:
+          - **Browser (if applicable)**: Chrome 96, Firefox 94
+          - **React-PDF version**: 5.5.0
+          - **React version**: 17.0.0
+          - **Webpack version (if applicable)**: 5.50.0
+      value: |
+          - **Browser (if applicable)**:
+          - **React-PDF version**:
+          - **React version**:
+          - **Webpack version (if applicable)**:
+      render: markdown

.github/ISSUE_TEMPLATE/Feature_request.yml

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+name: 🚀 Feature request
+description: I have a great idea for this project
+labels:
+  - enhancement
+body:
+  - type: checkboxes
+    attributes:
+      label: Before you start - checklist
+      options:
+        - label: I understand that React-PDF does not aim to be a fully-fledged PDF viewer and is only a tool to make one
+          required: true
+        - label: I have checked if this feature request is not already reported
+          required: true
+  - type: textarea
+    attributes:
+      label: Description
+      description: |
+        Describe what the problem is.
+
+        Example: _I'd like to add a feature that […]_
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Proposed solution
+      description: |
+        Describe the solution you'd like.
+
+        Example:
+          - Add a `foo` flag that, when toggled, enables the feature.
+  - type: textarea
+    attributes:
+      label: Alternatives
+      description: Describe alternative solutions or features you've considered, if any.
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: If applicable, add screenshots (preferably with browser console open) and files you have an issue with to help explain your problem.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: 🤔 Support question
+    url: https://stackoverflow.com/questions/tagged/react-pdf
+    about: This is a bug tracker, not a support forum. For usage questions, please use Discussions (see menu) or Stack Overflow ("Open" button) where there is a lot more people ready to help you out. Thanks!