Add bug report template, heavily derived from Sodium

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: "For reporting bugs and other defects"
+body:
+  - type: markdown
+    attributes:
+      value: >-
+        **Note: This issue tracker is not intended for support requests!** If you need help with crashes or other issues, then
+        you should [ask on our Discord server](https://discord.gg/rN9Y7caguP) instead. Unless you are certain that you
+        have found a defect, and you are able to point to where the problem is, you should not open an issue.
+        <br><br>
+        Additionally, please make sure you have done the following:
+        
+        - **Have you ensured that all of your mods (including ModernFix) are up-to-date?** The latest version of ModernFix
+        can always be found [on Modrinth](https://modrinth.com/mod/modernfix).
+        
+        - **Have you used the [search tool](https://github.com/embeddedt/ModernFix/issues) to check whether your issue
+        has already been reported?** If it has been, then consider adding more information to the existing issue instead.
+        
+        - **Have you determined the minimum set of instructions to reproduce the issue?** If your problem only occurs
+        with other mods installed, then you should narrow down exactly which mods are causing the issue. Please do not
+        provide your entire list of mods to us and expect that we will be able to figure out the problem.
+  - type: textarea
+    id: description
+    attributes:
+      label: Bug Description
+      description: >-
+        Use this section to describe the issue you are experiencing in as much depth as possible. The description should
+        explain what behavior you were expecting, and why you believe the issue to be a bug. If the issue you are reporting
+        only occurs with specific mods installed, then provide the name and version of each mod.
+
+        **Hint:** If you have any screenshots, videos, or other information that you feel is necessary to
+        explain the issue, you can attach them here.
+  - type: textarea
+    id: description-reproduction-steps
+    attributes:
+      label: Reproduction Steps
+      description: >-
+        Provide as much information as possible on how to reproduce this bug. Make sure your instructions are as clear and
+        concise as possible, because other people will need to be able to follow your guide in order to re-create the issue.
+        
+        **Hint:**  A common way to fill this section out is to write a step-by-step guide.
+    validations:
+      required: true
+  - type: textarea
+    id: log-file
+    attributes:
+      label: Log File
+      description: >-
+        **Hint:** You can usually find the log files within the folder `.minecraft/logs`. Most often, you will want the `latest.log`
+        file, since that file belongs to the last played session of the game.
+      placeholder: >-
+        Drag-and-drop the log file here.
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: For help with other issues, join our Discord community
+    url: https://discord.gg/rN9Y7caguP
+    about: This is the best option for getting help with mod installation, performance issues, and any other support inquiries
+    # Copied from https://github.com/CaffeineMC/sodium-fabric#community