Flatten directory structure and update documentation

- Moved all files from mac_os/ subdirectory to repository root
- Updated README.adoc to reflect simplified architecture
- Updated QUICK_INSTALL.md with all current apps
- Added claude-cli to install.sh and bin/install_homebrew_formulas
- Repository now shows clean file structure without nested mac_os folder
- Documentation now accurately describes opinionated installer approach

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.github/ISSUE_TEMPLATE/issue.md

@@ -0,0 +1,18 @@
+---
+name: Issue
+title: "Add|Update|Fix|Remove|Refactor "
+about: Report an issue. Please use only one of the subject prefixes.
+---
+
+<!--
+Please focus on well written issues. Context: https://alchemists.io/articles/software_issues.
+-->
+
+## Why
+<!-- Required. Describe, briefly, why this issue is important. -->
+
+## How
+<!-- Optional. List exact steps to implement or reproduce behavior. Screen shots/casts are welcome! -->
+
+## Notes
+<!-- Optional. Provide additional details like operating system, software version(s), stack dump, logs, or anything else that would be helpful. -->