Created by: qili93

Cherry-Pick of the following PRs:

4f53ecaa [DOC] update support model download link, test=develop, test=document_fix (#4388) 1a6880d6 [DOC] update support model list and remove cuda link, test=develop, test=document_fix (#4377) b2c14f01 [DOC] add model visualization, test=document_fix (#4439)

修改之后的页面可见：

• https://paddle-lite.readthedocs.io/zh/develop/introduction/support_model_list.html
• https://paddle-lite.readthedocs.io/zh/develop/user_guides/model_visualization.html