* test=update_icons, test=release/2.3

* test=update_icons, test=release/2.3

* update ERNIE-Layout introduction and ERNIE's tags

* change community models icon

* change ERNIE icon

* add nlp model icon

* add nlp model icon

* add ERNIE-M to model center

* add benchmark_en info.yaml

* remove unused cell

* rm image from repo and fix ipynb

* add introduction_en and fix some annotations

* add task to info.yaml

* add model_size and the number of parameters while modify ipynb following comments

* rewrite pretrained model into chinese

* modify task info

* test = add the PP-YOLOv2 Demo to ModerCenter

* test = update the PP-YOLOv2 Demo to ModerCenter

* test = update the PP-YOLOv2 Demo to ModerCenter

* test = add the folders for related models
Co-authored-by: NYang <yangyehua@baidu.com>