Streamline and centralize bug reporting guides

Before this change, there was three different bug reporting guides:

- [“Filing an issue on GitHub”][1]
- [“Reporting bugs”][2]
- [The issue template][3]

This commit:

1. makes sure that [the issue template][3] contains all of the same
   information that [“Filing an issue on GitHub”][1] and
   [“Reporting bugs”][2] did and
2. makes [“Reporting bugs”][2] simply tell users to fill out the
   template.

The goal of this change is to make reporting bugs easier. This change
accomplishes that goal by presenting bug reporters with all of the
information they need to know on the bug reporting page itself.

This commit partially implements this proposal:
<https://github.com/godotengine/godot-proposals/discussions/4083>

[1]: https://docs.godotengine.org/en/stable/community/contributing/ways_to_contribute.html#filing-an-issue-on-github
[2]: ./CONTRIBUTING.md#reporting-bugs
[3]: ./.github/ISSUE_TEMPLATE/bug_report.yml

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -5,9 +5,10 @@ body:
 - type: markdown
   attributes:
     value: |
-      - Read our [CONTRIBUTING.md guide](https://github.com/godotengine/godot/blob/master/CONTRIBUTING.md#reporting-bugs) on reporting bugs.
+      - When reporting bugs, you'll make our life simpler (and the fix will come sooner) if you follow the guidelines in this template.
       - Write a descriptive issue title above.
-      - Search [open](https://github.com/godotengine/godot/issues) and [closed](https://github.com/godotengine/godot/issues?q=is%3Aissue+is%3Aclosed) issues to ensure it has not already been reported.
+      - The golden rule is to **always open *one* issue for *one* bug**. If you notice several bugs and want to report them, make sure to create one new issue for each of them.
+      - Search [open](https://github.com/godotengine/godot/issues) and [closed](https://github.com/godotengine/godot/issues?q=is%3Aissue+is%3Aclosed) issues to ensure it has not already been reported. If you don't find a relevant match or if you're unsure, don't hesitate to **open a new issue**. The bugsquad will handle it from there if it's a duplicate.
       - Verify that you are using a [supported Godot version](https://docs.godotengine.org/en/stable/about/release_policy.html).
 
 - type: input
@@ -24,9 +25,11 @@ body:
   attributes:
     label: System information
     description: |
-      Specify the OS version, and when relevant hardware information.
-      For graphics-related issues, specify the GPU model, driver version, and the rendering backend (GLES2, GLES3, Vulkan).
-    placeholder: Windows 10, GLES3, Intel HD Graphics 620 (27.20.100.9616)
+      - Specify the OS version, and when relevant hardware information.
+      - For issues that are likely OS-specific and/or graphics-related, please specify the CPU model and architecture.
+      - For graphics-related issues, specify the GPU model, driver version, and the rendering backend (GLES2, GLES3, Vulkan).
+      - **Bug reports not including the required information may be closed at the maintainers' discretion.** If in doubt, always include all the requested information; it's better to include too much information than not enough information.
+    placeholder: Windows 10, Intel Core i5-7200U, GLES3, Intel HD Graphics 620 (27.20.100.9616)
   validations:
     required: true
 
@@ -52,8 +55,10 @@ body:
   attributes:
     label: Minimal reproduction project
     description: |
-      A small Godot project which reproduces the issue, with no unnecessary files included. Be sure to not include the `.godot` folder in the archive (but keep `project.godot`).
-      Required, unless the reproduction steps are trivial and don't require any project files to be followed. In this case, write "N/A" in the field.
-      Drag and drop a ZIP archive to upload it. **Do not select another field until the project is done uploading.**
+      - A small Godot project which reproduces the issue, with no unnecessary files included. Be sure to not include the `.godot` folder in the archive (but keep `project.godot`).
+      - Required, unless the reproduction steps are trivial and don't require any project files to be followed. In this case, write "N/A" in the field.
+      - Drag and drop a ZIP archive to upload it. **Do not select another field until the project is done uploading.**
+      - **Note for C# users:** If your issue is *not* Mono-specific, please upload a minimal reproduction project written in GDScript or VisualScript. This will make it easier for contributors to reproduce the issue locally as not everyone has a Mono setup available.
+      - **If you've been asked by a maintainer to upload a minimal reproduction project, you *must* do so within 7 days.** Otherwise, your bug report will be closed as it'll be considered too difficult to diagnose.
   validations:
     required: true