Replace to issue form (#16429)

.github/ISSUE_TEMPLATE/1.bug_report.yml

@@ -0,0 +1,42 @@
+name: Bug Report
+description: If something isn't working as expected
+labels: bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Make sure that you are submitting a new bug that was not previously reported or already fixed.
+
+        Please use a concise and distinct title for the issue.
+  - type: input
+    attributes:
+      label: Expected behaviour
+      description: What should have happened?
+    validations:
+      required: true
+  - type: input
+    attributes:
+      label: Actual behaviour
+      description: What happened?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Steps to reproduce the problem
+      description: What were you trying to do?
+      value: |
+        1.
+        2.
+        3.
+        ...
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Specifications
+      description: |
+        What version or commit hash of Mastodon did you find this bug in?
+
+        If a front-end issue, what browser and operating systems were you using?
+    validations:
+      required: true