fix(chapter): fix chapter conversion.

Still need to figure out the memory issues

Consolidates image conversion logic into a dedicated method.

This change streamlines the conversion process by centralizing the
setting of converted image data, extension, and size. It also
introduces a flag to track whether an image has been converted.

The old resource cleanup has been removed since it is not needed anymore.

.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        
+        {
+            "name": "Launch Package",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${fileDirname}"
+        }
+    ]
+}