Docs/bentoml integration (#4090)
* docs: first draft of BentoML integration
* Update the diffusers doc
* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* add BentoML integration guide under Optimization section
* restyle codes
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Co-authored-by: Sherlock113 <sherlockxu07@gmail.com>
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
