Major repository cleanup and enhancement

- Reorganize documentation: moved old docs to docs/ directory
- Add comprehensive README.md with build options and usage guide
- Add detailed CONTRIBUTING.md with help content management guide
- Create Makefile for automated building and testing
- Add Dockerfile.scratch for building from Ubuntu 20.04 base
- Enhance all Dockerfiles with PowerShell + PSScriptAnalyzer
- Add modern shells: zsh (with plugins) and fish (with config)
- Add modern CLI tools: fd-find, ripgrep, fzf
- Create comprehensive help system with cheat/TLDR/fish completions
- Add helper scripts for help content management and coverage checking
- Fix Dockerfile.remnux script references
- Support three build variants: upstream (REMnux), scratch (Ubuntu), kali

Build options:
  - make build-upstream: Fast, uses REMnux upstream (recommended)
  - make build-scratch: Full control, builds from Ubuntu 20.04
  - make build-kali: Legacy Kali Linux base

Features:
  - PowerShell with PSScriptAnalyzer module
  - Modern shells (zsh, fish) with custom configurations
  - Enhanced help system (cheat sheets, TLDR pages, fish completions)
  - Help coverage checking and bulk import tools
  - Comprehensive documentation for users and contributors

docs/tool-comparison.md

@@ -0,0 +1,74 @@
+# Tool Comparison: Current Kali vs REMnux
+
+## Current Tools in Kali-based Container
+
+### PDF Analysis Tools
+- **pdfid.py** - Schnelle Übersicht über PDF-Aufbau
+- **pdf-parser.py** - Zerlegen und extrahieren von PDF-Elementen  
+- **peepdf** - PDF-Analyse Framework mit Javascript Analyse
+- **pdftk** - Tool um das PDF zu "flatten"
+- **origami** (Ruby gems) - pdfcop, pdfextract, pdfmetadata
+
+### Malware Analysis Tools
+- **capa** - Malware capability detection
+- **box-js** - JavaScript sandbox analysis 
+- **oletools** (oledump.py, rtfdump.py, emldump.py, etc.)
+- **visidata** - Data exploration and analysis
+- **unfurl** - URL/data analysis
+
+### General Tools  
+- **exiftool** - Metadata extraction
+- **catdoc**, **docx2txt** - Document conversion
+- **unrtf** - RTF processing
+- **ImageMagick** - Image processing
+- **DidierStevens suite** - many analysis tools in /opt/didierstevenssuite/
+
+### System Tools
+- **mc** - Midnight Commander
+- **wget**, **git**, **p7zip-full**, **npm**
+
+## REMnux PDF Tools (Already Available)
+
+### PDF Analysis Suite (✅ Already have most)
+- **peepdf** ✅ - same tool
+- **origami** ✅ - same Ruby gem suite 
+- **pdf-parser.py** ✅ - same Didier Stevens tool
+- **pdfid.py** ✅ - same Didier Stevens tool
+- **pdftk-java** ✅ - same as pdftk but Java version
+- **qpdf** ❌ - PDF manipulation tool we don't have
+- **pdfresurrect** ❌ - Extract previous PDF versions, we don't have
+- **pdftool** ❌ - Analyze PDF incremental updates, we don't have
+
+### General Document Analysis (REMnux has)
+- **base64dump** ❌ - Didier Stevens Base64 decoder, we don't have  
+- **tesseract** ❌ - OCR tool, we don't have
+
+## Analysis: What We Need to Add
+
+### Tools REMnux has that we don't:
+1. **qpdf** - PDF manipulation (merge, convert, transform)
+2. **pdfresurrect** - Extract previous versions from PDFs
+3. **pdftool** - PDF incremental update analysis  
+4. **base64dump.py** - Base64 decoder (Didier Stevens)
+5. **tesseract** - OCR tool
+
+### Tools we have that REMnux doesn't explicitly list:
+1. **capa** - Malware capability detection
+2. **box-js** - JavaScript sandbox
+3. **visidata** - Data exploration
+4. **unfurl** - URL/data analysis
+5. **ImageMagick** - Image processing
+6. **catdoc/docx2txt** - Document conversion
+
+## Migration Strategy
+
+REMnux base image will provide:
+- All our current PDF tools (peepdf, origami, pdf-parser.py, pdfid.py, pdftk)
+- Plus additional tools (qpdf, pdfresurrect, pdftool, base64dump, tesseract)
+
+We need to add:
+- capa (malware analysis)
+- box-js (JavaScript analysis)  
+- visidata (data exploration)
+- unfurl (URL analysis)
+- Our German documentation files