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

Dockerfile.remnux

@@ -10,10 +10,16 @@ RUN apt-get update && apt-get install -y \
     busybox \
     catdoc \
     docx2txt \
+    fd-find \
+    fish \
     fzf \
     mc \
     pipx \
+    ripgrep \
     unrtf \
+    zsh \
+    zsh-autosuggestions \
+    zsh-syntax-highlighting \
     && rm -rf /var/lib/apt/lists/*
 
 # Configure pip  
@@ -38,38 +44,42 @@ RUN PIPX_HOME=/opt/pipx PIPX_BIN_DIR=/usr/local/bin pipx install --include-deps
 RUN PIPX_HOME=/opt/pipx PIPX_BIN_DIR=/usr/local/bin pipx install --include-deps cheat \
     && PIPX_HOME=/opt/pipx PIPX_BIN_DIR=/usr/local/bin pipx install --include-deps tldr
 
-# Install navi for interactive cheat sheets
-RUN wget https://github.com/denisidoro/navi/releases/download/v2.23.0/navi-v2.23.0-x86_64-unknown-linux-musl.tar.gz -O /tmp/navi.tar.gz \
-    && tar -xzf /tmp/navi.tar.gz -C /usr/local/bin \
-    && chmod +x /usr/local/bin/navi \
-    && rm /tmp/navi.tar.gz
+# Removed navi - focus on tldr and cheat for reliable help system
 
 # Create data directory and set permissions
 RUN mkdir -p /data \
     && chown remnux:remnux /data
 
-# Add documentation and search tools
+# Add documentation and streamlined help system
 ADD files/README /opt/README
 ADD files/command_help /opt/command_help
-ADD scripts/download-docs.sh /usr/local/bin/download-docs.sh
+ADD files/zshrc /etc/zsh/zshrc
+ADD files/fish_config.fish /etc/fish/conf.d/remnux.fish
+ADD scripts/create-offline-help-system.sh /usr/local/bin/create-offline-help-system.sh
 ADD scripts/find-tool /usr/local/bin/find-tool
-ADD scripts/help /usr/local/bin/help
-ADD cheatsheets/ /opt/cheatsheets/
+ADD scripts/fhelp /usr/local/bin/fhelp
+ADD scripts/import-remnux-cheatsheets.sh /usr/local/bin/import-remnux-cheatsheets.sh
+ADD scripts/convert-remnux-cheats.py /usr/local/bin/convert-remnux-cheats.py
+ADD scripts/add-tool-cheats.sh /usr/local/bin/add-tool-cheats.sh
 
-# Download REMnux documentation and create searchable database
-RUN chmod +x /usr/local/bin/download-docs.sh /usr/local/bin/find-tool /usr/local/bin/help \
-    && /usr/local/bin/download-docs.sh
+# Create streamlined offline help system (tldr + cheat)
+RUN chmod +x /usr/local/bin/create-offline-help-system.sh /usr/local/bin/find-tool /usr/local/bin/fhelp /usr/local/bin/import-remnux-cheatsheets.sh \
+    && chmod +x /usr/local/bin/convert-remnux-cheats.py /usr/local/bin/add-tool-cheats.sh \
+    && /usr/local/bin/create-offline-help-system.sh \
+    && /usr/local/bin/add-tool-cheats.sh
 
 # Update bashrc with welcome message and comprehensive help info
 RUN echo 'cat /opt/README' >> /etc/bash.bashrc \
     && echo 'echo ""' >> /etc/bash.bashrc \
     && echo 'echo "📚 Comprehensive Help System:"' >> /etc/bash.bashrc \
-    && echo 'echo "  help                    - Complete help system"' >> /etc/bash.bashrc \
-    && echo 'echo "  help tools pdf          - Find PDF analysis tools"' >> /etc/bash.bashrc \
-    && echo 'echo "  help cheat pdfid.py     - Show command examples"' >> /etc/bash.bashrc \
-    && echo 'echo "  help examples           - Browse all examples (navi)"' >> /etc/bash.bashrc \
-    && echo 'echo "  help pdf                - PDF analysis workflow"' >> /etc/bash.bashrc \
-    && echo 'echo ""' >> /etc/bash.bashrc
+    && echo 'echo "  fhelp                   - Complete file analysis help"' >> /etc/bash.bashrc \
+    && echo 'echo "  fhelp tools pdf         - Find PDF analysis tools"' >> /etc/bash.bashrc \
+    && echo 'echo "  fhelp cheat pdfid.py    - Show command examples"' >> /etc/bash.bashrc \
+    && echo 'echo "  fhelp examples          - Browse all examples"' >> /etc/bash.bashrc \
+    && echo 'echo "  fhelp pdf               - PDF analysis workflow"' >> /etc/bash.bashrc \
+    && echo 'echo ""' >> /etc/bash.bashrc \
+    && echo 'alias analyse="fhelp"' >> /etc/bash.bashrc \
+    && echo 'alias ?="fhelp"' >> /etc/bash.bashrc
 
 # Switch to remnux user (REMnux default user)
 USER remnux