Prepare v0.4 release and open source docs

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a reproducible problem in I Hate PDFs
+title: ""
+labels: bug
+assignees: ""
+---
+
+## Summary
+
+What happened?
+
+## Expected Behavior
+
+What did you expect to happen?
+
+## Steps To Reproduce
+
+1.
+2.
+3.
+
+## Environment
+
+- I Hate PDFs version/build:
+- macOS version:
+- Install source: GitHub release or Mac App Store
+- Mac architecture: Apple Silicon or Intel
+
+## Screenshots Or Recordings
+
+Attach screenshots or recordings for UI problems. Each file must be under 1 MB.
+
+## Additional Context
+
+Add any relevant PDF workflow details. Do not attach private PDFs publicly.