DevKit updates (#224)

.github/Bug_report.md

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+---
+name: Bug Report
+about: Report errors and problems
+
+---
+
+<!--
+    The Symfony Code of Conduct applies to all the activity on this repository.
+    See https://symfony.com/doc/current/contributing/code_of_conduct/index.html
+-->
+
+**Description**  
+<!-- A clear and concise description of the problem. -->
+
+**How to reproduce**  
+<!-- Code and/or config needed to reproduce the problem. If it's a complex bug,
+     create a "bug reproducer" as explained in:
+     https://symfony.com/doc/current/contributing/code/reproducer.html -->
+
+**Possible Solution**  
+<!--- Optional: only if you have suggestions on a fix/reason for the bug -->
+
+**Additional context**  
+<!-- Optional: any other context about the problem: log messages, screenshots, etc. -->

.github/Documentation_issue.md

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+---
+name: Documentation Issue
+about: Anything related to Symfony CMF Documentation
+
+---
+
+Symfony CMF Documentation has its own dedicated repository. Please open your
+documentation-related issue at https://github.com/symfony-cmf/symfony-cmf-docs/issues
+
+Thanks!

.github/Feature_request.md

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+---
+name: Feature Request
+about: RFC and ideas for new features and improvements
+
+---
+
+**Description**  
+<!-- A clear and concise description of the new feature. -->
+
+**Example**  
+<!-- A simple example of the new feature in action (include PHP code, YAML config, etc.)
+     If the new feature changes an existing feature, include a simple before/after comparison. -->

.github/Security_issue.md

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+---
+name: Security Issue
+about: Report security-related errors
+
+---
+
+If you have found a security issue in Symfony, please send the details to
+[David](mailto:[email protected]) or [Maximilian](mailto:[email protected]) and don't disclose it publicly until we can provide a
+fix for it.

.github/Support_question.md

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+---
+name: Support Question
+about: Questions about using Symfony CMF and its components
+
+---
+
+**Description**
+<!-- A clear and concise description of the problem. -->
+
+**How to reproduce (optional)**
+<!-- Optional: Only if you have something to reproduce. Code and/or config needed to reproduce the problem.  -->
+
+**Possible Solution**  
+<!-- Optional: only if you have suggestions to solve it -->
+