FR: Automatically Save Images Locally on Card Link Creation

[greetclammy]

Please add an option to automatically download external images and favicons and save them locally when creating a card link, replacing the current behavior of embedding the image URL.

Rationale:

1. Future-proofing: Ensures images remain accessible even if the original host becomes unavailable.
2. Privacy: Eliminates subsequent callbacks to the image host.
3. Offline use: Enables to view images without an internet connection.

This change would be more aligned with Obsidian's ethos.

Thank you!