PR template: titles start with [FEATURE REQUEST], [BUG REPORT] or [Other]

.github/pull_request_template.md

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+<!--
+Title: start with the type, for example
+  [FEATURE REQUEST] Add dark mode to the settings page
+  [BUG REPORT] Fix a crash when opening an empty file
+  [Other] Update the README install steps
+-->
+
+## Type
+
+- [ ] **[FEATURE REQUEST]**: a new feature or an improvement
+- [ ] **[BUG REPORT]**: a bug fix
+- [ ] **[Other]**: docs, refactoring, CI, dependencies or chores
+
+## What and why
+
+<!-- One or two sentences. Link the issue: Closes #123 -->
+
+## Bug details
+
+<!-- [BUG REPORT] only; delete this section otherwise. -->
+
+- Steps to reproduce:
+- Expected:
+- Actual:
+- Cause and fix:
+
+## How it was tested
+
+<!-- Commands you ran, and what you checked by hand. -->
+
+## Checklist
+
+- [ ] The title starts with `[FEATURE REQUEST]`, `[BUG REPORT]` or `[Other]`
+- [ ] Tests and the build pass locally
+- [ ] Docs are updated if behaviour changed