* update ppdet docs & remove static code, test=document_fix

* add pphuman doc, test=document_fix

* update action doc, test=document_fix

* update activity, test=document_fix

* given inference model path, download model automatically

* encapsulate auto download model as a function

* given note that default model dir is download link

* change attr model download path to https://bj.bcebos.com/v1/paddledet/models/pipeline/PPLCNet_x1_0_person_attribute_945_infer.zip

* add pphuman mot doc, test=document_fix

* add mot data tutorials, test=document_fix

* fix pphuman cfg doc, test=document_fix

* fix doc, test=document_fix

* remove en readme doc, test=document_fix

* refactor doc, test=document_fix

* update yolox & yolov5, test=document_fix

* Update README_cn.md

* update doc, test=document_fix

* Update readme and pphuman readme

* Update README.md

* add data & customize, test=document_fix

* update readme

* Update README_cn.md

* Update README_cn.md

* add template, test=document_fix
Co-authored-by: NYixinKristy <576550767@qq.com>

* add ppyoloe-s, update mot doc, test=document_fix

* fix doc typo, test=document_fix

* add dataset links, test=document_fix

* add ai-studio link, test=document_fix

* update pphuman en doc, test=document_fix

* update doc

* add entrance_count draw_center_traj save_mot_txts

* fix pphuman plot_tracking_dict

* fix pphuman plot_tracking_dict

* fix plot tracking dict

* fix pipeline mot plot, add gif

* fix collector append, test=document_fix

* add Doc for action

* update docs

* add attr doc

* update attr intro

* add pphuman doc

* add pphuman doc & add enable_attr, enable_action

* update doc

* update pphuman-tech.png