📚 DOCS improvement (#778)

.github/ISSUE_TEMPLATE/1-bug-report.yml

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+name: Bug Report
+description: Create a bug report 🐛
+labels: ['bug']
+body:
+  - type: markdown
+    attributes:
+      value: Thank you for taking the time to file a bug report! Please fill out this form as completely as possible.
+  - type: input
+    attributes:
+      label: What version of `myst-parser` are you using?
+      description: 'For example: 1.0.0'
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: What version dependencies are you using?
+      description: 'e.g. for docutils and sphinx'
+    validations:
+      required: true
+  - type: dropdown
+    id: os
+    attributes:
+      label: What operating system are you using?
+      options:
+        - Mac
+        - Windows
+        - Linux
+        - Other
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe the Bug
+      description: A clear and concise description of the bug.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Expected Behavior
+      description: A clear and concise description of what you expected to happen.
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: To Reproduce
+      description: Steps to reproduce the behavior, please provide clear and concise steps.
+    validations:
+      required: false
+  - type: markdown
+    attributes:
+      value: Please ensure the steps you've provided reproduce the issue to the best of your ability.
+  - type: markdown
+    attributes:
+      value: Ideally, maintainers should be able to follow the steps provided in order to reproduce the bug.
+  - type: markdown
+    attributes:
+      value: Thank you for helping out the MyST team, these issues are what makes MyST better!!

.github/ISSUE_TEMPLATE/2-feature-request.yml

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+name: Feature Request
+description: Request a new feature ✨
+labels: ['enhancement']
+body:
+  - type: markdown
+    attributes:
+      value: Thank you for taking the time to submit a feature request! Please fill out this form as completely as possible.
+  - type: textarea
+    attributes:
+      label: Describe the feature you'd like to request
+      description: A clear and concise description of what you want and what your use case is.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe the solution you'd like
+      description: A clear and concise description of what you want to happen.
+  - type: textarea
+    attributes:
+      label: Describe alternatives you've considered
+      description: A clear and concise description of any alternative solutions or features you've considered.

.github/ISSUE_TEMPLATE/3-documentation.yml

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+name: Feature Request
+description: Suggest improvements to the documentation 📖
+labels: ['documentation']
+body:
+  - type: markdown
+    attributes:
+      value: Thank you for taking the time to submit a suggestion! Please fill out this form as completely as possible.
+  - type: textarea
+    attributes:
+      label: Describe the gap in the current documentation
+      description: A clear and concise description of what area is currently missing or unclear.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Describe the solution you'd like
+      description: A clear and concise description of what you would like to see in the documentation.

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Ask a question 💬
+    url: https://github.com/executablebooks/MyST-Parser/discussions
+    about: Ask questions and discuss ideas with other community members