[SDXL-IP2P] Add gif for demonstrating training processes (#4342)
* [SDXL-IP2P] Add gif for demonstrating training processes
* [SDXL-IP2P] Add gif for demonstrating training processes
* [SDXL-IP2P] Change gif to URLs
* [SDXL-IP2P] Add URLs in case gif now show
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Co-authored-by: Harutatsu Akiyama <kf.zy.qin@gmail.com>