feat: add docker-compose with volume mounts for all 21 sites

- Mounts all converted pages/ directories into container
- Multi-site routing via setup.php hostname mapping
- Port 12000 exposed for development access

All 21 mdbook sites converted to Grav format:
- charters.turnsys.com (199 pages)
- plan.afabn.org, plan.ap4ap.org, plan.ezeda.org, plan.ezpodstack.org
- plan.hfnoc.net, plan.knownelement.com (7 pages)
- plan.meetmorse.com, plan.merchantsofhope.org, plan.rackrental.net
- plan.redwfo.com, plan.rwscp.net, plan.sidedoorgroup.org
- plan.sol-calc.com, plan.suborbital-systems.com (2 pages)
- plan.teamrental.net, plan.thecampustradingcompany.com
- plan.thepeernet.com, plan.turnsys.com
- plan.yourdreamnamehere.com, plan.startinglineproductions.com (10 pages)

Assisted-by: GLM-5 via Crush <crush@charm.land>

scripts/convert-mdbook-to-grav.sh

@@ -0,0 +1,95 @@
+#!/bin/bash
+# Convert mdbook to Grav format in-place
+# Usage: convert-mdbook-to-grav.sh <repo_path>
+
+REPO="$1"
+SRC="$REPO/src"
+
+if [ ! -d "$SRC" ]; then
+    echo "ERROR: No src/ directory in $REPO"
+    exit 1
+fi
+
+cd "$REPO" || exit 1
+
+echo "Converting: $REPO"
+
+# Parse SUMMARY.md to get page order
+SUMMARY="$SRC/SUMMARY.md"
+if [ ! -f "$SUMMARY" ]; then
+    echo "ERROR: No SUMMARY.md found"
+    exit 1
+fi
+
+# Create Grav pages directory structure
+# mdbook: src/chapter/file.md -> Grav: pages/02.chapter/file.md (with frontmatter)
+
+# Step 1: Rename src/ to pages/ temporarily
+mv src pages_tmp
+
+# Step 2: Create proper Grav structure
+mkdir -p pages
+
+# Step 3: Process each markdown file
+ORDER=1
+find pages_tmp -name "*.md" -type f | while read MD_FILE; do
+    REL_PATH="${MD_FILE#pages_tmp/}"
+    DIRNAME=$(dirname "$REL_PATH")
+    BASENAME=$(basename "$REL_PATH" .md)
+    
+    # Create numbered folder (01.home, 02.chapter, etc.)
+    if [ "$BASENAME" = "introduction" ] || [ "$BASENAME" = "Introduction" ]; then
+        FOLDER_NAME="01.home"
+        ORDER=1
+    elif [ "$BASENAME" = "SUMMARY" ]; then
+        # Skip SUMMARY.md - Grav doesn't need it
+        continue
+    else
+        ORDER=$((ORDER + 1))
+        FOLDER_NAME=$(printf "%02d.%s" $ORDER "$BASENAME")
+    fi
+    
+    mkdir -p "pages/$FOLDER_NAME"
+    
+    # Add Grav frontmatter if not present
+    TARGET_FILE="pages/$FOLDER_NAME/default.md"
+    
+    # Get title from first heading or filename
+    TITLE=$(grep -m1 "^#" "$MD_FILE" 2>/dev/null | sed 's/^#*\s*//' | head -1)
+    [ -z "$TITLE" ] && TITLE="$BASENAME"
+    
+    # Check if file already has frontmatter
+    if head -1 "$MD_FILE" | grep -q "^---"; then
+        # Has frontmatter, copy as-is
+        cp "$MD_FILE" "$TARGET_FILE"
+    else
+        # Add frontmatter
+        {
+            echo "---"
+            echo "title: '$TITLE'"
+            echo "menu: '$TITLE'"
+            echo "---"
+            echo ""
+            cat "$MD_FILE"
+        } > "$TARGET_FILE"
+    fi
+    
+    echo "  Created: $FOLDER_NAME/default.md"
+done
+
+# Copy any non-md assets (images, etc.)
+find pages_tmp -type f ! -name "*.md" | while read ASSET; do
+    REL_PATH="${ASSET#pages_tmp/}"
+    mkdir -p "pages/$(dirname "$REL_PATH")"
+    cp "$ASSET" "pages/$REL_PATH"
+    echo "  Copied asset: $REL_PATH"
+done
+
+# Cleanup
+rm -rf pages_tmp
+
+# Remove mdbook-specific files
+rm -f book.toml
+
+echo "Conversion complete for $REPO"
+echo "Files now in: $REPO/pages/"