GAP -- Unable to delete assets on move/delete

[hvanyo]

Acceptance Criteria:
There is script available in bodiless cli, that will do the following:

• scan the static/images/pages folder and for pages that don't present in src/data/pages should be deleted.

Issue/background

• during development of Move Assets on Moved paged #1198
• we encountered an issue with gatsby images that after page moves/assets move, gatsby images still refer back to original.
• we are implementing a workaround to only copy assets and on delete (we aren't deleting assets implemented in chore(page): Page package wodenx/Bodiless-JS#19)

Workaround:
We need to implement a workaround solution to check if static/images/pages has any extra page folders compared to src/data/pages and delete them... to actually delete the assets from the move.