Update Github templates (#8593)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,32 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: Unconfirmed bug
+assignees: ''
+---
+
+##### Minetest version
+<!--
+Paste Minetest version between quotes below
+If you are on a devel version, please add git commit hash
+You can use `minetest --version` to find it.
+-->
+```
+
+```
+
+##### OS / Hardware
+<!-- General information about your hardware and operating system -->
+Operating system:
+CPU:
+
+<!-- For graphical issues only -->
+GPU model:
+OpenGL version:
+
+##### Summary
+<!-- Describe your problem here -->
+
+##### Steps to reproduce
+<!-- For bug reports or build issues, explain how the problem happened -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: Feature request
+assignees: ''
+---
+
+## Problem
+
+A clear and concise description of what the problem is.
+ie: Why is this needed?
+Ex. I'm always frustrated when [...]
+
+## Solutions
+
+A clear and concise description of what you want to happen.
+
+## Alternatives
+
+A clear and concise description of any alternative solutions or features you've considered.
+
+## Additional context
+
+Add any other context or screenshots about the feature request here.