Add more issue template(s) and pull request template (#7269)

Merge pull request 7269

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Is something not working as expected?
+---
+
+<!--
+  Hi! Thanks for considering to file a bug with Jekyll. Please take the time to
+  answer the basic questions. Please try to be as detailed as possible.
+
+  If you are unsure this is a bug in Jekyll, or this is a bug caused
+  by a plugin that isn't directly related to Jekyll, or if this is just
+  a generic usage question, please consider asking your question at
+  https://talk.jekyllrb.com where non-bug questions go.
+
+  Thanks!
+-->
+
+<!-- 
+  Make sure that you've done all of these. If you're sure that the bug you're
+  reporting is only apparent in a previous version of Jekyll, please say so explicitly
+  in your description.
+
+  - I updated to the latest Jekyll (or) if on GitHub Pages to the latest `github-pages`
+  - I ran `jekyll doctor` to check my configuration
+  - I read the contributing document at https://jekyllrb.com/docs/contributing/
+-->
+
+## My Environment
+
+<!--
+  Replace the values in the Version(s) column with the ones in your build. If you're not
+  using `github-pages`, just replace it with "No".
+-->
+
+| Software         | Version(s) |
+| ---------------- | ---------- |
+| Operating System |            |
+| `jekyll`         | Latest     |
+| `github-pages`   | Latest     |
+
+---
+
+## Expected Behaviour
+
+<!--
+  What is it you expected to happen? This should be a description of how the
+  functionality you tried to use is supposed to work.
+-->
+
+## Current Behavior
+
+<!--
+  Describe the details of the bug. Be sure to include any steps you took for the
+  problem to exist, such as the directories you created and the full command
+  you ran. Include any plugins you have installed (this is very important!).
+
+  You can include any logs you think relevant here. If you're using GitHub pages
+  and you're not sure where your logs are, please email support@github.com and
+  they will happily help you.
+-->
+
+## Code Sample
+
+<!--
+  Please provide a code repository, gist, code snippet or sample files to
+  reproduce the issue.
+-->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Want us to add any features to Jekyll?
+---
+
+<!--
+  Hi! Thanks for considering to file a feature request with Jekyll. Please take the time to
+  answer the basic questions. Please try to be as detailed as possible.
+
+  Thanks!
+-->
+
+## Summary
+
+<!--
+  A one-paragraph explanation of the feature.
+-->
+
+## Motivation
+
+<!--
+  Why do you want to see this feature in Jekyll? What makes you sure that it should not be
+  implemented at the plugin level, but in Jekyll core? What use cases does it support?
+
+  NOTE: Please be mindful of the Jekyll philosophy (https://jekyllrb.com/philosophy/),
+  particularily Section 5. Think about if 90% of the users would benefit from your
+  feature request, and whether your feature would be better off in a plugin.
+-->
+
+## Guide-level explanation
+
+<!--
+  Explain the proposal as if it was already included in the project and you
+  were teaching it to another programmer. That generally means:
+
+  - Introducing new named concepts.
+  - Explaining the feature largely in terms of examples.
+  - If applicable, provide sample error messages, deprecation warnings, or
+    migration guidance.
+
+  If this is a small feature, you may omit this section.
+-->
+
+## Reference-level explanation
+
+<!--
+  This is the technical portion of the feature request. Explain the design in
+  sufficient detail that:
+
+  - Its interaction with other features is clear.
+  - It is reasonably clear how the feature would be implemented.
+  - Corner cases are dissected by example.
+
+  If you do not know how to answer this, you can omit it. No worries!
+-->
+
+## Drawbacks
+
+<!--
+  Why should we *not* do this?
+-->
+
+## Unresolved Questions
+
+<!--
+  What related issues do you consider out of scope for this feature that could be
+  addressed in the future independently of the solution that comes out of this
+  feature?
+-->

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: Have any questions about how Jekyll works?
+---
+
+<!--
+  The Jekyll issue tracker IS NOT for usage questions! Please post your
+  question on our dedicated forum at https://talk.jekyllrb.com.
+
+  Thank you!
+-->