enhance: Leave trace on source note while using selectionExtract

[Harshita-mindfire]

# enhance(workspace) : Leave a trace on source note when using selectionExtract

PR for docs update: https://github.com/dendronhq/dendron-site/pulls

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[hikchoi]

Left some comments on potential improvements 🙂

[jonathanyeung]

lgtm

[hikchoi]

Changes look good 👍🏼