Update issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a reproducible bug or regression in Hydrus.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--
+  Please provide a clear and concise description of what the bug is (in the section _Steps to reproduce_).
+  Include screenshots if needed.
+  Please test using the latest Hydrus release to make sure your issue has not already been fixed.
+  If you are having issues with lag, please check this article first before opening an issue: https://hydrusnetwork.github.io/hydrus/help/reducing_lag.html
+-->
+
+## Environment
+
+Hydrus version: 
+Platform: 
+OS specifics: 
+
+<!--
+  Platform can be one of: Windows, Linux, macOS (or a combination)
+  OS specifics: e.g. OS version, Linux distribution...
+-->
+
+## Steps to reproduce
+
+1.
+2.
+3.
+
+<!--
+  Issues without reproduction steps are likely to stall.
+-->
+
+## Describe what you expected to happen
+
+## Error message / Log file
+
+<!--
+  Please paste the error message or attach a log file if there's anything in there that seems relevant.
+-->