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

scripts/find-tool

@@ -68,7 +68,7 @@ search_tools() {
     echo -e "${CYAN}🔍 Searching for: ${YELLOW}$search_term${NC}"
     echo ""
 
-    # Search in tool names, descriptions, categories, and usage hints
+    # Search in tool names, descriptions, categories, and usage hints (5 fields now)
     local matches=$(awk -F'|' -v term="$search_term" '
         /^[^#]/ && (tolower($1) ~ tolower(term) || tolower($2) ~ tolower(term) || tolower($3) ~ tolower(term) || tolower($4) ~ tolower(term)) {
             print $0
@@ -82,17 +82,17 @@ search_tools() {
     fi
 
     local count=0
-    echo "$matches" | while IFS='|' read -r name description category usage; do
+    echo "$matches" | while IFS='|' read -r name description category usage available; do
         count=$((count + 1))
         echo -e "${GREEN}🔧 $name${NC}"
-        echo -e "   ${BLUE}Description:${NC} $description"
-        echo -e "   ${BLUE}Category:${NC} $category"
+        echo -e "   Description: $description"
+        echo -e "   Category: $category"
         if [[ -n "$usage" && "$usage" != " " ]]; then
-            echo -e "   ${BLUE}Usage:${NC} $usage"
+            echo -e "   Usage: $usage"
         fi
         
-        # Check if tool exists on system
-        if command -v "$name" >/dev/null 2>&1; then
+        # Use availability status from database instead of checking command
+        if [[ "$available" == "✓" ]]; then
             echo -e "   ${GREEN}✓ Available${NC}"
         else
             echo -e "   ${YELLOW}⚠ Check path or alternative name${NC}"