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/FUNDING.yml

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+github: [bkuhlmann]

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Community
+    url: https://alchemists.io/community
+    about: Please ask questions or discuss specifics here.
+  - name: Security
+    url: https://alchemists.io/policies/security
+    about: Please report security vulnerabilities here.

.github/ISSUE_TEMPLATE/issue.md

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+---
+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. -->

.github/PULL_REQUEST_TEMPLATE.md

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+## Overview
+<!-- Required. Describe, briefly, why this is necessary and what the overarching architecture is. -->
+
+## Screenshots/Screencasts
+<!-- Optional. Provide supporting screen shots/casts. -->
+
+## Details
+<!-- Optional. As bullet points, list related issue(s); major highlights; team callouts; and/or other information that is helpful. -->