chore: Update start_server.sh to only copy notebooks if they have changed

start_server.sh

@@ -6,7 +6,7 @@ if [ ! -d /data ]; then
     sudo chown user:user /data
 fi
 
-# Copy notebooks to /data, appending _UPDATED to filenames if they already exist
+# Copy notebooks to /data, appending _UPDATED to filenames if they have changed
 shopt -s globstar
 for file in /home/user/notebooks/**/*; do
     if [ -f "$file" ]; then
@@ -17,10 +17,13 @@ for file in /home/user/notebooks/**/*; do
             mkdir -p "$target_dir"
         fi
         if [ -e "$target_file" ]; then
-            new_filename="${target_file%.*}_UPDATED.${target_file##*.}"
-            target_file="$new_filename"
+            if ! cmp -s "$file" "$target_file"; then
+                new_filename="${target_file%.*}_UPDATED.${target_file##*.}"
+                cp "$file" "$new_filename"
+            fi
+        else
+            cp "$file" "$target_file"
         fi
-        cp "$file" "$target_file"
     fi
 done