Clean up resource direcotry

[Marph]

This might be another tool to do the job:

Joplin Vacuum - A Python script to remove orphaned resources

Hi there! I enjoyed using Joplin, but currently if a note is deleted, the resources used in the note is not automatically deleted, resulting in orphaned resources. I tried to search around and found an issue on Github: Potential orphaned resources left on sync target on resource conflict · Issue #5223 · laurent22/joplin (github.com). One solution is first export all notes to JEX file then reimport. Based on this method, I wrote a small Python script that takes in a JEX file and automatically r…