* add dygraph prune quick_start

* add mobile deploy doc

* complete deploy doc

* add images

* fix a error;

* fix some error
Co-authored-by: Ngmm <38800877+mmglove@users.noreply.github.com>

* add export model and depth

* update

* add ofa api docs

* quant quick_start update

* quant quick_start update

* add ofa_ernie
* add ofa_bert
* add bert and update ernie

* post_quant_static: remove the cache params, add optimize_model params, test=develop
Co-authored-by: NBai Yifan <me@ethanbai.com>

* use default settings and update benchmark data
Co-authored-by: Ncc <52520497+juncaipeng@users.noreply.github.com>

* add zh doc for quant_post_only_weight

* fix details

* fix details

* fix

* update

* Add mkldnn quantization demo and document

* fix

* fix

* update

* update

* update quantization doc

* update quant_embedding demo

* refine reader config

* support multi-cards in darts

* fix

* fix win

* add darts en api doc

* add darts ch api doc

* fix example code

* fix

* fix some trouble

* update