Add comprehensive offline help system with fuzzy search

🎯 Enhanced Features:
- Integrated navi, cheat, tldr, and fzf for interactive help
- Custom cheat sheets for PDF analysis, malware analysis, and system utilities
- find-tool command for fuzzy searching through all REMnux tools
- Comprehensive help command with workflows and examples
- Complete offline documentation system

📚 Help System Components:
- help                    - Main help system
- help tools [term]       - Search for tools (fuzzy matching)
- help cheat <tool>       - Show command examples
- help examples           - Browse examples interactively (navi + fzf)
- help pdf/malware/forensics - Analysis workflows
- help --offline          - Verify offline capabilities

🛠️ Tools Added:
- navi: Interactive cheat sheet browser
- cheat: Command-line cheat sheets
- tldr: Quick command examples
- fzf: Fuzzy finder (already included)

All documentation works completely offline with local REMnux docs database
and custom cheat sheets for analysis workflows.

Dockerfile.remnux

@@ -10,6 +10,7 @@ RUN apt-get update && apt-get install -y \
     busybox \
     catdoc \
     docx2txt \
+    fzf \
     mc \
     pipx \
     unrtf \
@@ -33,14 +34,42 @@ RUN PIPX_HOME=/opt/pipx PIPX_BIN_DIR=/usr/local/bin pipx install --include-deps
 # Install visidata via pipx (for data exploration)
 RUN PIPX_HOME=/opt/pipx PIPX_BIN_DIR=/usr/local/bin pipx install --include-deps visidata
 
+# Install offline help and cheat sheet tools
+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
+
 # Create data directory and set permissions
 RUN mkdir -p /data \
     && chown remnux:remnux /data
 
-# Add German documentation files
+# Add documentation and search tools
 ADD files/README /opt/README
 ADD files/command_help /opt/command_help
-RUN echo 'cat /opt/README' >> /etc/bash.bashrc
+ADD scripts/download-docs.sh /usr/local/bin/download-docs.sh
+ADD scripts/find-tool /usr/local/bin/find-tool
+ADD scripts/help /usr/local/bin/help
+ADD cheatsheets/ /opt/cheatsheets/
+
+# 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
+
+# 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
 
 # Switch to remnux user (REMnux default user)
 USER remnux