LCM-LoRA docs (#5782)
* begin doc
* fix examples
* add in toctree
* fix toctree
* improve copy
* improve introductions
* add lcm doc
* fix filename
* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
* address Sayak's comments
* remove controlnet aux
* open in colab
* move to Specific pipeline examples
* update controlent and adapter examples
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Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>
